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Finance refers to monetary resources and to the study and discipline of money, currency, assets and liabilities.^[a] As a subject of study, it is related to but distinct from economics, which is the study of the production, distribution, and consumption of goods and services.^[b] Based on the scope of financial activities in financial systems, the discipline can be divided into personal, corporate, and public finance.

In these financial systems, assets are bought, sold, or traded as financial instruments, such as currencies, loans, bonds, shares, stocks, options, futures, etc. Assets can also be banked, invested, and insured to maximize value and minimize loss. In practice, risks are always present in any financial action and entities.

Due to its wide scope, a broad range of subfields exists within finance. Asset-, money-, risk- and investment management aim to maximize value and minimize volatility. Financial analysis assesses the viability, stability, and profitability of an action or entity. Some fields are multidisciplinary, such as mathematical finance, financial law, financial economics, financial engineering and financial technology. These fields are the foundation of business and accounting. In some cases, theories in finance can be tested using the scientific method, covered by experimental finance.

The early history of finance parallels the early history of money, which is prehistoric. Ancient and medieval civilizations incorporated basic functions of finance, such as banking, trading and accounting, into their economies. In the late 19th century, the global financial system was formed.

In the middle of the 20th century, finance emerged as a distinct academic discipline,^[c] separate from economics.^[1] The earliest doctoral programs in finance were established in the 1960s and 1970s.^[2] Today, finance is also widely studied through career-focused undergraduate and master's level programs.^[3][4]

As outlined, the financial system consists of the flows of capital that take place between individuals and households (personal finance), governments (public finance), and businesses (corporate finance). "Finance" thus studies the process of channeling money from savers and investors to entities that need it. ^[d] Savers and investors have money available which could earn interest or dividends if put to productive use. Individuals, companies and governments must obtain money from some external source, such as loans or credit, when they lack sufficient funds to run their operations.

In general, an entity whose income exceeds its expenditure can lend or invest the excess, intending to earn a fair return. Correspondingly, an entity where income is less than expenditure can raise capital usually in one of two ways: (i) by borrowing in the form of a loan (private individuals), or by selling government or corporate bonds; (ii) by a corporation selling equity, also called stock or shares (which may take various forms: preferred stock or common stock). The owners of both bonds and stock may be institutional investors—financial institutions such as investment banks and pension funds—or private individuals, called private investors or retail investors. (See Financial market participants.)

The lending is often indirect, through a financial intermediary such as a bank, or via the purchase of notes or bonds (corporate bonds, government bonds, or mutual bonds) in the bond market. The lender receives interest, the borrower pays a higher interest than the lender receives, and the financial intermediary earns the difference for arranging the loan.^[6][7][8] A bank aggregates the activities of many borrowers and lenders. A bank accepts deposits from lenders, on which it pays interest. The bank then lends these deposits to borrowers. Banks allow borrowers and lenders, of different sizes, to coordinate their activity.

Investing typically entails the purchase of stock, either individual securities or via a mutual fund, for example. Stocks are usually sold by corporations to investors so as to raise required capital in the form of "equity financing", as distinct from the debt financing described above. The financial intermediaries here are the investment banks. The investment banks find the initial investors and facilitate the listing of the securities, typically shares and bonds. Additionally, they facilitate the securities exchanges, which allow their trade thereafter, as well as the various service providers which manage the performance or risk of these investments. These latter include mutual funds, pension funds, wealth managers, and stock brokers, typically servicing retail investors (private individuals).

Inter-institutional trade and investment, and fund-management at this scale, is referred to as "wholesale finance". Institutions here extend the products offered, with related trading, to include bespoke options, swaps, and structured products, as well as specialized financing; this "financial engineering" is inherently mathematical, and these institutions are then the major employers of "quants" (see below). In these institutions, risk management, regulatory capital, and compliance play major roles.

As outlined, finance comprises, broadly, the three areas of personal finance, corporate finance, and public finance. These, in turn, overlap and employ various activities and sub-disciplines—chiefly investments, risk management, and quantitative finance.

Personal finance refers to the practice of budgeting to ensure enough funds are available to meet basic needs, while ensuring there is only a reasonable level of risk to lose said capital. Personal finance may involve paying for education, financing durable goods such as real estate and cars, buying insurance, investing, and saving for retirement.^[9] Personal finance may also involve paying for a loan or other debt obligations. The main areas of personal finance are considered to be income, spending, saving, investing, and protection. The following steps, as outlined by the Financial Planning Standards Board,^[10] suggest that an individual will understand a potentially secure personal finance plan after:

• Purchasing insurance to ensure protection against unforeseen personal events;
• Understanding the effects of tax policies, subsidies, or penalties on the management of personal finances;
• Understanding the effects of credit on individual financial standing;
• Developing a savings plan or financing for large purchases (auto, education, home);
• Planning a secure financial future in an environment of economic instability;
• Pursuing a checking or a savings account;
• Preparing for retirement or other long term expenses.^[11]

Corporate finance deals with the actions that managers take to increase the value of the firm to the shareholders, the sources of funding and the capital structure of corporations, and the tools and analysis used to allocate financial resources. While corporate finance is in principle different from managerial finance, which studies the financial management of all firms rather than corporations alone, the concepts are applicable to the financial problems of all firms,^[12] and this area is then often referred to as "business finance".

Typically, "corporate finance" relates to the long term objective of maximizing the value of the entity's assets, its stock, and its return to shareholders, while also balancing risk and profitability. This entails^[13] three primary areas:

1. Capital budgeting: selecting which projects to invest in—here, accurately determining value is crucial, as judgements about asset values can be "make or break".^[14]
2. Dividend policy: the use of "excess" funds—these are to be reinvested in the business or returned to shareholders.
3. Capital structure: deciding on the mix of funding to be used—here attempting to find the optimal capital mix re debt-commitments vs cost of capital.

The latter creates the link with investment banking and securities trading, as above, in that the capital raised will generically comprise debt, i.e. corporate bonds, and equity, often listed shares. Re risk management within corporates, see below.

Financial managers—i.e. as distinct from corporate financiers—focus more on the short term elements of profitability, cash flow, and "working capital management" (inventory, credit and debtors), ensuring that the firm can safely and profitably carry out its financial and operational objectives; i.e. that it: (1) can service both maturing short-term debt repayments, and scheduled long-term debt payments, and (2) has sufficient cash flow for ongoing and upcoming operational expenses. (See Financial management and FP&A.)

Public finance describes finance as related to sovereign states, sub-national entities, and related public entities or agencies. It generally encompasses a long-term strategic perspective regarding investment decisions that affect public entities.^[15] These long-term strategic periods typically encompass five or more years.^[16] Public finance is primarily concerned with:^[17]

• Identification of required expenditures of a public sector entity;
• Source(s) of that entity's revenue;
• The budgeting process;
• Sovereign debt issuance, or municipal bonds for public works projects.

Central banks, such as the Federal Reserve System banks in the United States and the Bank of England in the United Kingdom, are strong players in public finance. They act as lenders of last resort as well as strong influences on monetary and credit conditions in the economy.^[18]

Development finance, which is related, concerns investment in economic development projects provided by a (quasi) governmental institution on a non-commercial basis; these projects would otherwise not be able to get financing. A public–private partnership is primarily used for infrastructure projects: a private sector corporate provides the financing up-front, and then draws profits from taxpayers or users. Climate finance, and the related Environmental finance, address the financial strategies, resources and instruments used in climate change mitigation.

Investment management^[12] is the professional asset management of various securities—typically shares and bonds, but also other assets, such as real estate, commodities and alternative investments—in order to meet specified investment goals for the benefit of investors.

As above, investors may be institutions, such as insurance companies, pension funds, corporations, charities, educational establishments, or private investors, either directly via investment contracts or, more commonly, via collective investment schemes like mutual funds, exchange-traded funds, or real estate investment trusts.

At the heart of investment management^[12] is asset allocation—diversifying the exposure among these asset classes, and among individual securities within each asset class—as appropriate to the client's investment policy, in turn, a function of risk profile, investment goals, and investment horizon (see Investor profile). Here:

• Portfolio optimization is the process of selecting the best portfolio given the client's objectives and constraints.
• Fundamental analysis is the approach typically applied in valuing and evaluating the individual securities.
• Technical analysis is about forecasting future asset prices with past data.^[19]

Overlaid is the portfolio manager's investment style—broadly, active vs passive, value vs growth, and small cap vs. large cap—and investment strategy.

In a well-diversified portfolio, achieved investment performance will, in general, largely be a function of the asset mix selected, while the individual securities are less impactful. The specific approach or philosophy will also be significant, depending on the extent to which it is complementary with the market cycle.

Additional to diversification, the fundamental risk mitigant here, investment managers will apply various hedging techniques as appropriate,^[12] these may relate to the portfolio as a whole or to individual stocks. Bond portfolios are often (instead) managed via cash flow matching or immunization, while for derivative portfolios and positions, traders use "the Greeks" to measure and then offset sensitivities. In parallel, managers – active and passive – will monitor tracking error, thereby minimizing and preempting any underperformance vs their "benchmark".

A quantitative fund is managed using computer-based mathematical techniques (increasingly, machine learning) instead of human judgment. The actual trading is typically automated via sophisticated algorithms.

Risk management, in general, is the study of how to control risks and balance the possibility of gains; it is the process of measuring risk and then developing and implementing strategies to manage that risk. Financial risk management^[20][21] is the practice of protecting corporate value against financial risks, often by "hedging" exposure to these using financial instruments. The focus is particularly on credit and market risk, and in banks, through regulatory capital, includes operational risk.

• Credit risk is the risk of default on a debt that may arise from a borrower failing to make required payments;
• Market risk relates to losses arising from movements in market variables such as prices and exchange rates;
• Operational risk relates to failures in internal processes, people, and systems, or to external events (these risks will often be insured).

Financial risk management is related to corporate finance^[12] in two ways. Firstly, firm exposure to market risk is a direct result of previous capital investments and funding decisions; while credit risk arises from the business's credit policy and is often addressed through credit insurance and provisioning. Secondly, both disciplines share the goal of enhancing or at least preserving, the firm's economic value, and in this context^[22] overlaps also enterprise risk management, typically the domain of strategic management. Here, businesses devote much time and effort to forecasting, analytics and performance monitoring. (See ALM and treasury management.)

For banks and other wholesale institutions,^[23] risk management focuses on managing, and as necessary hedging, the various positions held by the institution—both trading positions and long term exposures—and on calculating and monitoring the resultant economic capital, and regulatory capital under Basel III. The calculations here are mathematically sophisticated, and within the domain of quantitative finance as below. Credit risk is inherent in the business of banking, but additionally, these institutions are exposed to counterparty credit risk. Banks typically employ Middle office "Risk Groups", whereas front office risk teams provide risk "services" (or "solutions") to customers.

Insurers ^[24] manage their own risks with a focus on solvency and the ability to pay claims: Life Insurers are concerned more with longevity risk and interest rate risk; Short-Term Insurers (Property, Health,Casualty) emphasize catastrophe- and claims volatility risks. For expected claims reserves are set aside periodically, while to absorb unexpected losses, a minimum level of capital is maintained.

Quantitative finance—also referred to as "mathematical finance"—includes those finance activities where a sophisticated mathematical model is required,^[25] and thus overlaps several of the above.

As a specialized practice area, quantitative finance comprises primarily three sub-disciplines; the underlying theory and techniques are discussed in the next section:

1. Quantitative finance is often synonymous with financial engineering. This area generally underpins a bank's customer-driven derivatives business—delivering bespoke OTC-contracts and "exotics", and designing the various structured products and solutions mentioned—and encompasses modeling and programming in support of the initial trade, and its subsequent hedging and management.
2. Quantitative finance also significantly overlaps financial risk management in banking, as mentioned, both as regards this hedging, and as regards economic capital as well as compliance with regulations and the Basel capital / liquidity requirements.
3. "Quants" are also responsible for building and deploying the investment strategies at the quantitative funds mentioned; they are also involved in quantitative investing more generally, in areas such as trading strategy formulation, and in automated trading, high-frequency trading, algorithmic trading, and program trading.

Financial theory is studied and developed within the disciplines of management, (financial) economics, accountancy and applied mathematics. In the abstract,^[12][26] finance is concerned with the investment and deployment of assets and liabilities over "space and time"; i.e., it is about performing valuation and asset allocation today, based on the risk and uncertainty of future outcomes while appropriately incorporating the time value of money. Determining the present value of these future values, "discounting", must be at the risk-appropriate discount rate, in turn, a major focus of finance-theory.^[27]As financial theory has roots in many disciplines, including mathematics, statistics, economics, physics, and psychology, it can be considered a mix of an art and science,^[28] and there are ongoing related efforts to organize a list of unsolved problems in finance.

Managerial finance ^[30] is the branch of finance that deals with the financial aspects of the management of a company, and the financial dimension of managerial decision-making more broadly. It provides the theoretical underpin for the practice described above, concerning itself with the managerial application of the various finance techniques. Academics working in this area are typically based in business school finance departments, in accounting, or in management science.

The tools addressed and developed relate in the main to managerial accounting and corporate finance: the former allow management to better understand, and hence act on, financial information relating to profitability and performance; the latter, as above, are about optimizing the overall financial structure, including its impact on working capital. Key aspects of managerial finance thus include:

1. Financial planning and forecasting
2. Capital budgeting
3. Capital structure
4. Working capital management
5. Risk management
6. Financial analysis and reporting.

The discussion, however, extends to business strategy more broadly, emphasizing alignment with the company's overall strategic objectives; and similarly incorporates the managerial perspectives of planning, directing, and controlling.

Financial economics^[32] is the branch of economics that studies the interrelation of financial variables, such as prices, interest rates and shares, as opposed to real economic variables, i.e. goods and services. It thus centers on pricing, decision making, and risk management in the financial markets,^[32][26] and produces many of the commonly employed financial models. (Financial econometrics is the branch of financial economics that uses econometric techniques to parameterize the relationships suggested.)

The discipline has two main areas of focus:^[26] asset pricing and corporate finance; the first being the perspective of providers of capital, i.e. investors, and the second of users of capital; respectively:

1. Asset pricing theory develops the models used in determining the risk-appropriate discount rate, and in pricing derivatives; and includes the portfolio- and investment theory applied in asset management. The analysis essentially explores how rational investors would apply risk and return to the problem of investment under uncertainty, producing the key "Fundamental theorem of asset pricing". Here, the twin assumptions of rationality and market efficiency lead to modern portfolio theory (the CAPM), and to the Black–Scholes theory for option valuation. At more advanced levels—and often in response to financial crises—the study then extends these "neoclassical" models to incorporate phenomena where their assumptions do not hold, or to more general settings.
2. Much of corporate finance theory, by contrast, considers investment under "certainty" (Fisher separation theorem, "theory of investment value", and Modigliani–Miller theorem). Here, theory and methods are developed for the decisioning about funding, dividends, and capital structure discussed above. A recent development is to incorporate uncertainty and contingency—and thus various elements of asset pricing—into these decisions, employing for example real options analysis.

Financial mathematics^[34] is the field of applied mathematics concerned with financial markets; Louis Bachelier's doctoral thesis, defended in 1900, is considered to be the first scholarly work in this area. The field is largely focused on the modeling of derivatives—with much emphasis on interest rate- and credit risk modeling—while other important areas include insurance mathematics and quantitative portfolio management. Relatedly, the techniques developed are applied to pricing and hedging a wide range of asset-backed, government, and corporate-securities.

As above, in terms of practice, the field is referred to as quantitative finance and / or mathematical finance, and comprises primarily the three areas discussed. The main mathematical tools and techniques are, correspondingly:

• for derivatives,^[35] Itô's stochastic calculus, simulation, and partial differential equations; see aside boxed discussion re the prototypical Black-Scholes model and the various numeric techniques now applied
• for risk management,^[23] value at risk, stress testing and "sensitivities" analysis (applying the "greeks"); the underlying mathematics comprises mixture models, PCA, volatility clustering and copulas.^[36]
• in both of these areas, and particularly for portfolio problems, quants employ sophisticated optimization techniques

Mathematically, these separate into two analytic branches: derivatives pricing uses risk-neutral probability (or arbitrage-pricing probability), denoted by "Q"; while risk and portfolio management generally use physical (or actual or actuarial) probability, denoted by "P". These are interrelated through the above "Fundamental theorem of asset pricing".

The subject has a close relationship with financial economics, which, as outlined, is concerned with much of the underlying theory that is involved in financial mathematics: generally, financial mathematics will derive and extend the mathematical models suggested. Computational finance is the branch of (applied) computer science that deals with problems of practical interest in finance, and especially^[34] emphasizes the numerical methods applied here.

Experimental finance^[37] aims to establish different market settings and environments to experimentally observe and provide a lens through which science can analyze agents' behavior and the resulting characteristics of trading flows, information diffusion, and aggregation, price setting mechanisms, and returns processes. Researchers in experimental finance can study to what extent existing financial economics theory makes valid predictions and therefore prove them, as well as attempt to discover new principles on which such theory can be extended and be applied to future financial decisions. Research may proceed by conducting trading simulations or by establishing and studying the behavior of people in artificial, competitive, market-like settings.

Behavioral finance studies how the psychology of investors or managers affects financial decisions and markets^[38] and is relevant when making a decision that can impact either negatively or positively on one of their areas. With more in-depth research into behavioral finance, it is possible to bridge what actually happens in financial markets with analysis based on financial theory.^[39] Behavioral finance has grown over the last few decades to become an integral aspect of finance.^[40]

Behavioral finance includes such topics as:

1. Empirical studies that demonstrate significant deviations from classical theories;
2. Models of how psychology affects and impacts trading and prices;
3. Forecasting based on these methods;
4. Studies of experimental asset markets and the use of models to forecast experiments.

A strand of behavioral finance has been dubbed quantitative behavioral finance, which uses mathematical and statistical methodology to understand behavioral biases in conjunction with valuation.

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Quantum finance involves applying quantum mechanical approaches to financial theory, providing novel methods and perspectives in the field.^[41] Quantum finance is an interdisciplinary field, in which theories and methods developed by quantum physicists and economists are applied to solve financial problems. It represents a branch known as econophysics. Although quantum computational methods have been around for quite some time and use the basic principles of physics to better understand the ways to implement and manage cash flows, it is mathematics that is actually important in this new scenario^[42] Finance theory is heavily based on financial instrument pricing such as stock option pricing. Many of the problems facing the finance community have no known analytical solution. As a result, numerical methods and computer simulations for solving these problems have proliferated. This research area is known as computational finance. Many computational finance problems have a high degree of computational complexity and are slow to converge to a solution on classical computers. In particular, when it comes to option pricing, there is additional complexity resulting from the need to respond to quickly changing markets. For example, in order to take advantage of inaccurately priced stock options, the computation must complete before the next change in the almost continuously changing stock market. As a result, the finance community is always looking for ways to overcome the resulting performance issues that arise when pricing options. This has led to research that applies alternative computing techniques to finance. Most commonly used quantum financial models are quantum continuous model, quantum binomial model, multi-step quantum binomial model etc.

The origin of finance can be traced to the beginning of state formation and trade during the Bronze Age. The earliest historical evidence of finance is dated to around 3000 BCE. Banking originated in West Asia, where temples and palaces were used as safe places for the storage of valuables. Initially, the only valuable that could be deposited was grain, but cattle and precious materials were eventually included. During the same period, the Sumerian city of Uruk in Mesopotamia supported trade by lending as well as the use of interest. In Sumerian, "interest" was mas, which translates to "calf". In Greece and Egypt, the words used for interest, tokos and ms respectively, meant "to give birth". In these cultures, interest indicated a valuable increase, and seemed to consider it from the lender's point of view.^[43] The Code of Hammurabi (1792–1750 BCE) included laws governing banking operations. The Babylonians were accustomed to charging interest at the rate of 20 percent per year. By 1200 BCE, cowrie shells were used as a form of money in China.

The use of coins as a means of representing money began in the years between 700 and 500 BCE.^[44] Herodotus mentions the use of crude coins in Lydia around 687 BCE and, by 640 BCE, the Lydians had started to use coin money more widely and opened permanent retail shops.^[45] Shortly after, cities in Classical Greece, such as Aegina, Athens, and Corinth, started minting their own coins between 595 and 570 BCE. During the Roman Republic, interest was outlawed by the Lex Genucia reforms in 342 BCE, though the provision went largely unenforced. Under Julius Caesar, a ceiling on interest rates of 12% was set, and much later under Justinian it was lowered even further to between 4% and 8%.^[46]

The first stock exchange was opened in Antwerp in 1531.^[47] Since then, popular exchanges such as the London Stock Exchange (founded in 1773) and the New York Stock Exchange (founded in 1793) were created.^[48][49]

• 2007–2008 financial crisis
• Outline of finance

• Graham, Benjamin; Jason Zweig (2003-07-08) [1949]. The Intelligent Investor. Warren E. Buffett (collaborator) (2003 ed.). HarperCollins. front cover. ISBN 0-06-055566-1.
• Graham, Benjamin; Dodd, David LeFevre (1934). Security Analysis: The Classic 1934 Edition. McGraw-Hill Education. ISBN 978-0-070-24496-2. LCCN 34023635.
• Bogle, John Bogle (2007). The Little Book of Common Sense Investing: The Only Way to Guarantee Your Fair Share of Stock Market Returns. John Wiley and Sons. pp. 216. ISBN 9780470102107.
• Buffett, W.; Cunningham, L.A. (2009). The Essays of Warren Buffett: Lessons for Investors and Managers. John Wiley & Sons (Asia) Pte Limited. ISBN 978-0-470-82441-2.
• Kiyosaki, Robert and Sharon Lechter (2000). Rich Dad Poor Dad: What the Rich Teach Their Kids About Money That the Poor and Middle Class Do Not! Warner Business Books. ISBN 0-446-67745-0
• Stanley, Thomas J.; Danko, W.D. (1998). The Millionaire Next Door. Gallery Books. ISBN 978-0-671-01520-6. LCCN 98046515.
• Soros, George (1988). The Alchemy of Finance: Reading the Mind of the Market. A Touchstone book. Simon & Schuster. ISBN 978-0-671-66238-7. LCCN 87004745.
• Fisher, Philip Arthur (1996). Common Stocks and Uncommon Profits and Other Writings. Wiley Investment Classics. Wiley. ISBN 978-0-471-11927-2. LCCN 95051449.

• Finance Definition (Investopedia)
• Hypertextual Finance Glossary (Campbell Harvey)
• Finance Glossary (Pierre Vernimmen)
• Glossary of financial risk management terms (Risk.net)
• Glossary of Key Investment Terms (PIMCO)
• Corporate finance resources (Aswath Damodaran)
• Financial management resources (James Van Horne)
• Personal finance resources (Financial Literacy and Education Commission, mymoney.gov)
• Public finance resources (Governance and Social Development Resource Centre, gsdrc.org) [Archived 2023-06-02 at the Wayback Machine]
• Risk management resources (Global Risk Institute)

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Accounting
Constant purchasing power Historical cost Management Tax
Major types Audit Budget Cost Forensic Financial Fund Governmental Management Social Tax
Key concepts Accounting period Accrual Constant purchasing power Economic entity Fair value Going concern Historical cost Matching principle Materiality Revenue recognition Unit of account
Selected accounts Assets Cash Cost of goods sold Depreciation / Amortization (business) Equity Expenses Goodwill Liabilities Profit Revenue
Accounting standards Generally-accepted principles Generally-accepted auditing standards Convergence International Financial Reporting Standards International Standards on Auditing Management Accounting Principles
Financial statements Annual report Balance sheet Cash-flow Equity Income Management discussion Financial statement analysis
Bookkeeping Bank reconciliation Debits and credits Double-entry system FIFO and LIFO Journal Ledger / General ledger Trial balance
Auditing Financial Internal Firms Report Sarbanes–Oxley Act
People and organizations Accountants Accounting organizations Luca Pacioli
Development History Research Positive accounting Sarbanes–Oxley Act
Misconduct Creative Earnings management Error account Hollywood Off-balance-sheet Two sets of books

Accounting, also known as accountancy, is the process of recording and processing information about economic entities, such as businesses and corporations.^[1][2] Accounting measures the results of an organization's economic activities and conveys this information to a variety of stakeholders, including investors, creditors, management, and regulators.^[3] Practitioners of accounting are known as accountants. The terms "accounting" and "financial reporting" are often used interchangeably.^[4]

Accounting can be divided into several fields including financial accounting, management accounting, tax accounting and cost accounting.^[5] Financial accounting focuses on the reporting of an organization's financial information, including the preparation of financial statements, to the external users of the information, such as investors, regulators and suppliers.^[6] Management accounting focuses on the measurement, analysis and reporting of information for internal use by management to enhance business operations.^[1][6] The recording of financial transactions, so that summaries of the financials may be presented in financial reports, is known as bookkeeping, of which double-entry bookkeeping is the most common system.^[7] Accounting information systems are designed to support accounting functions and related activities.

Accounting has existed in various forms and levels of sophistication throughout human history. The double-entry accounting system in use today was developed in medieval Europe, particularly in Venice, and is usually attributed to the Italian mathematician and Franciscan friar Luca Pacioli.^[8] Today, accounting is facilitated by accounting organizations such as standard-setters, accounting firms and professional bodies. Financial statements are usually audited by accounting firms,^[9] and are prepared in accordance with generally accepted accounting principles (GAAP).^[6] GAAP is set by various standard-setting organizations such as the Financial Accounting Standards Board (FASB) in the United States^[1] and the Financial Reporting Council in the United Kingdom. As of 2012, "all major economies" have plans to converge towards or adopt the International Financial Reporting Standards (IFRS).^[10][11]

Accounting is thousands of years old and can be traced to ancient civilizations.^[12][13][14] One early development of accounting dates back to ancient Mesopotamia and is closely related to developments in writing, counting and money;^[12] there is also evidence of early forms of bookkeeping in ancient Iran,^[15][16] and early auditing systems by the ancient Egyptians and Babylonians.^[13] By the time of Emperor Augustus, the Roman government had access to detailed financial information.^[17]

Many concepts related to today's accounting seem to be initiated in medieval's Middle East. For example, Jewish communities used double-entry bookkeeping in the early-medieval period^[18][19] and Muslim societies, at least since the 10th century also used many modern accounting concepts.^[20]

The spread of the use of Arabic numerals, instead of the Roman numbers historically used in Europe, increased efficiency of accounting procedures among Mediterranean merchants,^[21] who further refined accounting in medieval Europe.^[22] With the development of joint-stock companies, accounting split into financial accounting and management accounting.

The first published work on a double-entry bookkeeping system was the Summa de arithmetica, published in Italy in 1494 by Luca Pacioli (the "Father of Accounting").^[23][24] Accounting began to transition into an organized profession in the nineteenth century,^[25][26] with local professional bodies in England merging to form the Institute of Chartered Accountants in England and Wales in 1880.^[27]

Both the words "accounting" and "accountancy" were in use in Great Britain by the mid-1800s and are derived from the words accompting and accountantship used in the 18th century.^[28] In Middle English (used roughly between the 12th and the late 15th century), the verb "to account" had the form accounten, which was derived from the Old French word aconter,^[29] which is in turn related to the Vulgar Latin word computare, meaning "to reckon". The base of computare is putare, which "variously meant to prune, to purify, to correct an account, hence, to count or calculate, as well as to think".^[29]

The word "accountant" is derived from the French word compter, which is also derived from the Italian and Latin word computare. The word was formerly written in English as "accomptant", but in process of time the word, which was always pronounced by dropping the "p", became gradually changed both in pronunciation and in orthography to its present form.^[30]

Accounting has variously been defined as the keeping or preparation of the financial records of transactions of the firm, the analysis, verification and reporting of such records and "the principles and procedures of accounting"; it also refers to the job of being an accountant.^[31][32][33]

Accountancy refers to the occupation or profession of an accountant,^[34][35][36] particularly in British English.^[31][32]

Accounting has several subfields or subject areas, including financial accounting, management accounting, auditing, taxation and accounting information systems.^[5]

Financial accounting focuses on the reporting of an organization's financial information to external users of the information, such as investors, potential investors and creditors. It calculates and records business transactions and prepares financial statements for the external users in accordance with generally accepted accounting principles (GAAP).^[6] GAAP, in turn, arises from the wide agreement between accounting theory and practice, and changes over time to meet the needs of decision-makers.^[1]

Financial accounting produces past-oriented reports—for example financial statements are often published six to ten months after the end of the accounting period—on an annual or quarterly basis, generally about the organization as a whole.^[6]

Management accounting focuses on the measurement, analysis and reporting of information that can help managers in making decisions to fulfill the goals of an organization. In management accounting, internal measures and reports are based on cost–benefit analysis, and are not required to follow the generally accepted accounting principle (GAAP).^[6] In 2014 CIMA created the Global Management Accounting Principles (GMAPs). The result of research from across 20 countries in five continents, the principles aim to guide best practice in the discipline.^[37]

Management accounting produces past-oriented reports with time spans that vary widely, but it also encompasses future-oriented reports such as budgets. Management accounting reports often include financial and non financial information, and may, for example, focus on specific products and departments.^[6]

Intercompany accounting focuses on the measurement, analysis and reporting of information between separate entities that are related, such as a parent company and its subsidiary companies. Intercompany accounting concerns record keeping of transactions between companies that have common ownership such as a parent company and a partially or wholly owned subsidiary. Intercompany transactions are also recorded in accounting when business is transacted between companies with a common parent company (subsidiaries).^[38][39]

Auditing is the verification of assertions made by others regarding a payoff,^[40] and in the context of accounting it is the "unbiased examination and evaluation of the financial statements of an organization".^[41] Audit is a professional service that is systematic and conventional.^[42]

An audit of financial statements aims to express or disclaim an independent opinion on the financial statements. The auditor expresses an independent opinion on the fairness with which the financial statements presents the financial position, results of operations, and cash flows of an entity, in accordance with the generally accepted accounting principles (GAAP) and "in all material respects". An auditor is also required to identify circumstances in which the generally accepted accounting principles (GAAP) have not been consistently observed.^[43]

An accounting information system is a part of an organization's information system used for processing accounting data.^[44] Many corporations use artificial intelligence-based information systems. The banking and finance industry uses AI in fraud detection. The retail industry uses AI for customer services. AI is also used in the cybersecurity industry. It involves computer hardware and software systems using statistics and modeling.^[45]

Many accounting practices have been simplified with the help of accounting computer-based software. An enterprise resource planning (ERP) system is commonly used for a large organisation and it provides a comprehensive, centralized, integrated source of information that companies can use to manage all major business processes, from purchasing to manufacturing to human resources. These systems can be cloud based and available on demand via application or browser, or available as software installed on specific computers or local servers, often referred to as on-premise.

Tax accounting in the United States concentrates on the preparation, analysis and presentation of tax payments and tax returns. The U.S. tax system requires the use of specialised accounting principles for tax purposes which can differ from the generally accepted accounting principles (GAAP) for financial reporting.^[46] U.S. tax law covers four basic forms of business ownership: sole proprietorship, partnership, corporation, and limited liability company. Corporate and personal income are taxed at different rates, both varying according to income levels and including varying marginal rates (taxed on each additional dollar of income) and average rates (set as a percentage of overall income).^[46]

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Forensic accounting is a specialty practice area of accounting that describes engagements that result from actual or anticipated disputes or litigation.^[47] "Forensic" means "suitable for use in a court of law", and it is to that standard and potential outcome that forensic accountants generally have to work.

Political campaign accounting deals with the development and implementation of financial systems and the accounting of financial transactions in compliance with laws governing political campaign operations. This branch of accounting was first formally introduced in the March 1976 issue of The Journal of Accountancy.^[48]

Professional accounting bodies include the American Institute of Certified Public Accountants (AICPA) and the other 179 members of the International Federation of Accountants (IFAC),^[49] including Institute of Chartered Accountants of Scotland (ICAS), Institute of Chartered Accountants of Pakistan (ICAP), CPA Australia, Institute of Chartered Accountants of India, Association of Chartered Certified Accountants (ACCA) and Institute of Chartered Accountants in England and Wales (ICAEW). Some countries have a single professional accounting body and, in some other countries, professional bodies for subfields of the accounting professions also exist, for example the Chartered Institute of Management Accountants (CIMA) in the UK and Institute of management accountants in the United States.^[50] Many of these professional bodies offer education and training including qualification and administration for various accounting designations, such as certified public accountant (AICPA) and chartered accountant.^[51][52]

Depending on its size, a company may be legally required to have their financial statements audited by a qualified auditor, and audits are usually carried out by accounting firms.^[9]

Accounting firms grew in the United States and Europe in the late nineteenth and early twentieth century, and through several mergers there were large international accounting firms by the mid-twentieth century. Further large mergers in the late twentieth century led to the dominance of the auditing market by the "Big Five" accounting firms: Arthur Andersen, Deloitte, Ernst & Young, KPMG and PricewaterhouseCoopers.^[53] The demise of Arthur Andersen following the Enron scandal reduced the Big Five to the Big Four.^[54]

Generally accepted accounting principles (GAAP) are accounting standards issued by national regulatory bodies. In addition, the International Accounting Standards Board (IASB) issues the International Financial Reporting Standards (IFRS) implemented by 147 countries.^[1] Standards for international audit and assurance, ethics, education, and public sector accounting are all set by independent standard settings boards supported by IFAC. The International Auditing and Assurance Standards Board sets international standards for auditing, assurance, and quality control; the International Ethics Standards Board for Accountants (IESBA)^[55] sets the internationally appropriate principles-based Code of Ethics for Professional Accountants; the International Accounting Education Standards Board (IAESB) sets professional accounting education standards;^[56] and International Public Sector Accounting Standards Board (IPSASB) sets accrual-based international public sector accounting standards.^[57][4]

Organizations in individual countries may issue accounting standards unique to the countries. For example, in Australia, the Australian Accounting Standards Board manages the issuance of the accounting standards in line with IFRS. In the United States the Financial Accounting Standards Board (FASB) issues the Statements of Financial Accounting Standards, which form the basis of US GAAP,^[1] and in the United Kingdom the Financial Reporting Council (FRC) sets accounting standards.^[58] However, as of 2012 "all major economies" have plans to converge towards or adopt the IFRS.^[10]

At least a bachelor's degree in accounting or a related field is required for most accountant and auditor job positions, and some employers prefer applicants with a master's degree.^[59] A degree in accounting may also be required for, or may be used to fulfill the requirements for, membership to professional accounting bodies. For example, the education during an accounting degree can be used to fulfill the American Institute of CPA's (AICPA) 150 semester hour requirement,^[60] and associate membership with the Certified Public Accountants Association of the UK is available after gaining a degree in finance or accounting.^[61]

A doctorate is required in order to pursue a career in accounting academia, for example, to work as a university professor in accounting.^[62][63] The Doctor of Philosophy (PhD) and the Doctor of Business Administration (DBA) are the most popular degrees. The PhD is the most common degree for those wishing to pursue a career in academia, while DBA programs generally focus on equipping business executives for business or public careers requiring research skills and qualifications.^[62]

Professional accounting qualifications include the chartered accountant designations and other qualifications including certificates and diplomas.^[64] In Scotland, chartered accountants of ICAS undergo Continuous Professional Development and abide by the ICAS code of ethics.^[65] In England and Wales, chartered accountants of the ICAEW undergo annual training, and are bound by the ICAEW's code of ethics and subject to its disciplinary procedures.^[66]

In the United States, the requirements for joining the AICPA as a Certified Public Accountant are set by the Board of Accountancy of each state, and members agree to abide by the AICPA's Code of Professional Conduct and Bylaws.

The ACCA is the largest global accountancy body with over 320,000 members, and the organisation provides an 'IFRS stream' and a 'UK stream'. Students must pass a total of 14 exams, which are arranged across three levels.^[67]

Accounting research is research in the effects of economic events on the process of accounting, the effects of reported information on economic events, and the roles of accounting in organizations and society.^[68][69] It encompasses a broad range of research areas including financial accounting, management accounting, auditing and taxation.^[70]

Accounting research is carried out both by academic researchers and practicing accountants. Methodologies in academic accounting research include archival research, which examines "objective data collected from repositories"; experimental research, which examines data "the researcher gathered by administering treatments to subjects"; analytical research, which is "based on the act of formally modeling theories or substantiating ideas in mathematical terms"; interpretive research, which emphasizes the role of language, interpretation and understanding in accounting practice, "highlighting the symbolic structures and taken-for-granted themes which pattern the world in distinct ways"; critical research, which emphasizes the role of power and conflict in accounting practice; case studies; computer simulation; and field research.^[71][72]

Empirical studies document that leading accounting journals publish in total fewer research articles than comparable journals in economics and other business disciplines,^[73] and consequently, accounting scholars^[74] are relatively less successful in academic publishing than their business school peers.^[75] Due to different publication rates between accounting and other business disciplines, a recent study based on academic author rankings concludes that the competitive value of a single publication in a top-ranked journal is highest in accounting and lowest in marketing.^[76]

The year 2001 witnessed a series of financial information frauds involving Enron, auditing firm Arthur Andersen, the telecommunications company WorldCom, Qwest and Sunbeam, among other well-known corporations. These problems highlighted the need to review the effectiveness of accounting standards, auditing regulations and corporate governance principles. In some cases, management manipulated the figures shown in financial reports to indicate a better economic performance. In others, tax and regulatory incentives encouraged over-leveraging of companies and decisions to bear extraordinary and unjustified risk.^[77]

The Enron scandal deeply influenced the development of new regulations to improve the reliability of financial reporting, and increased public awareness about the importance of having accounting standards that show the financial reality of companies and the objectivity and independence of auditing firms.^[77]

In addition to being the largest bankruptcy reorganization in American history, the Enron scandal undoubtedly is the biggest audit failure^[78] causing the dissolution of Arthur Andersen, which at the time was one of the five largest accounting firms in the world. After a series of revelations involving irregular accounting procedures conducted throughout the 1990s, Enron filed for Chapter 11 bankruptcy protection in December 2001.^[79]

One consequence of these events was the passage of the Sarbanes–Oxley Act in the United States in 2002, as a result of the first admissions of fraudulent behavior made by Enron. The act significantly raises criminal penalties for securities fraud, for destroying, altering or fabricating records in federal investigations or any scheme or attempt to defraud shareholders.^[80]

Accounting fraud is an intentional misstatement or omission in the accounting records by management or employees which involves the use of deception. It is a criminal act and a breach of civil tort. It may involve collusion with third parties.^[81]

An accounting error is an unintentional misstatement or omission in the accounting records, for example misinterpretation of facts, mistakes in processing data, or oversights leading to incorrect estimates.^[81] Acts leading to accounting errors are not criminal but may breach civil law, for example, the tort of negligence.

The primary responsibility for the prevention and detection of fraud and errors rests with the entity's management.^[81]

• Accounting information system
• Accounting records
• Outline of accounting

• Library resources in your library and in other libraries about accounting
• Operations Research in Accounting on the Institute for Operations Research and the Management Sciences website