neoclassical economics Neoclassical economics is an approach to economics in which the production, consumption and valuation (pricing) of goods and services are observed as driven by the supply and demand model. According to this line of thought, the value of a good ...

, a market distortion is any event in which a

market Market is a term used to describe concepts such as: *Market (economics), system in which parties engage in transactions according to supply and demand *Market economy *Marketplace, a physical marketplace or public market Geography *Märket, an ...

reaches a

market clearing In economics, market clearing is the process by which, in an economic market, the supply of whatever is traded is equated to the demand so that there is no excess supply or demand. The new classical economics assumes that in any given market, assu ...

price for an item that is substantially different from the price that a market would achieve while operating under conditions of perfect competition and state enforcement of

legal contract A contract is a legally enforceable agreement between two or more parties that creates, defines, and governs mutual rights and obligations between them. A contract typically involves the transfer of goods, services, money, or a promise to tran ...

s and the ownership of private property. A distortion is "any departure from the ideal of perfect competition that therefore interferes with economic agents maximizing social welfare when they maximize their own". A proportional wage-income tax, for instance, is distortionary, whereas a

lump-sum tax A lump-sum tax is a special way of taxation, based on a fixed amount, rather than on the real circumstance of the taxed entity.

is not. In a

competitive equilibrium Competitive equilibrium (also called: Walrasian equilibrium) is a concept of economic equilibrium introduced by Kenneth Arrow and Gérard Debreu in 1951 appropriate for the analysis of commodity markets with flexible prices and many traders, and se ...

, a proportional wage income tax discourages work. In perfect competition with no externalities, there is zero distortion at market equilibrium of supply and demand where

price A price is the (usually not negative) quantity of payment or compensation given by one party to another in return for goods or services. In some situations, the price of production has a different name. If the product is a "good" in the ...

equals marginal cost for each firm and product. More generally, a measure of distortion is the deviation between the market price of a good and its marginal

social cost Social cost in neoclassical economics is the sum of the private costs resulting from a transaction and the costs imposed on the consumers as a consequence of being exposed to the transaction for which they are not compensated or charged. In other w ...

, that is, the difference between the

marginal rate of substitution In economics, the marginal rate of substitution (MRS) is the rate at which a consumer can give up some amount of one good in exchange for another good while maintaining the same level of utility. At equilibrium consumption levels (assuming no exte ...

in consumption and the

marginal rate of transformation Marginal may refer to: * ''Marginal'' (album), the third album of the Belgian rock band Dead Man Ray, released in 2001 * ''Marginal'' (manga) * '' El Marginal'', Argentine TV series * Marginal seat or marginal constituency or marginal, in polit ...

in production. Such a deviation may result from government

regulation Regulation is the management of complex systems according to a set of rules and trends. In systems theory, these types of rules exist in various fields of biology and society, but the term has slightly different meanings according to context. Fo ...

monopoly A monopoly (from Greek el, μόνος, mónos, single, alone, label=none and el, πωλεῖν, pōleîn, to sell, label=none), as described by Irving Fisher, is a market with the "absence of competition", creating a situation where a speci ...

tariff A tariff is a tax imposed by the government of a country or by a supranational union on imports or exports of goods. Besides being a source of revenue for the government, import duties can also be a form of regulation of foreign trade and pol ...

s and

import quota An import quota is a type of trade restriction that sets a physical limit on the quantity of a good that can be imported into a country in a given period of time. Quotas, like other trade restrictions, are typically used to benefit the producers ...

s, which in theory may give rise to

rent seeking Rent-seeking is the act of growing one's existing wealth without creating new wealth by manipulating the social or political environment. Rent-seeking activities have negative effects on the rest of society. They result in reduced economic effi ...

. Other sources of distortions are uncorrected

externalities In economics, an externality or external cost is an indirect cost or benefit to an uninvolved third party that arises as an effect of another party's (or parties') activity. Externalities can be considered as unpriced goods involved in either co ...

, different tax rates on goods or income,

inflation In economics, inflation is an increase in the general price level of goods and services in an economy. When the general price level rises, each unit of currency buys fewer goods and services; consequently, inflation corresponds to a reduct ...

, and incomplete information. Each of these may lead to a net loss in social surplus.• T. N. Srinivasan (1987). "distortions," '' The New Palgrave: A Dictionary of Economics'', v. 1, pp. 865-67.
• Joel Slemrod (1990). "Optimal Taxation and Optimal Tax Systems," ''Journal of Economic Perspectives'', 4(1),
p. 157
178. Market distortions are events, decisions, or interventions taken by governments, companies, or other agents, often in order to influence the market. They are often the response on market failures, i.e., circumstances that prevent perfect competition and achieving an optimal equilibrium in the market. In the context of markets, "perfect competition" means: * all participants have

complete information In economics and game theory, complete information is an economic situation or game in which knowledge about other market participants or players is available to all participants. The utility functions (including risk aversion), payoffs, strategies ...

, * there are no

entry Entry may refer to: *Entry, West Virginia, an unincorporated community in the United States *Entry (cards), a term used in trick-taking card-games *Entry (economics), a term in connection with markets *Entry (film), ''Entry'' (film), a 2013 Indian ...

or exit barriers to the market, * there are no

transaction cost In economics and related disciplines, a transaction cost is a cost in making any economic trade when participating in a market. Oliver E. Williamson defines transaction costs as the costs of running an economic system of companies, and unlike pro ...

s or

subsidies A subsidy or government incentive is a form of financial aid or support extended to an economic sector (business, or individual) generally with the aim of promoting economic and social policy. Although commonly extended from the government, the ter ...

affecting the market, * all firms have

constant returns to scale In economics, returns to scale describe what happens to long-run returns as the scale of production increases, when all input levels including physical capital usage are variable (able to be set by the firm). The concept of returns to scale arises ...

, and * all market participants are independent

rational Rationality is the quality of being guided by or based on reasons. In this regard, a person acts rationally if they have a good reason for what they do or a belief is rational if it is based on strong evidence. This quality can apply to an abi ...

actors. Many different kinds of events, actions, policies, or beliefs can bring about a market distortion. For example: * almost all types of

taxes A tax is a compulsory financial charge or some other type of levy imposed on a taxpayer (an individual or legal entity) by a governmental organization in order to fund government spending and various public expenditures (regional, local, o ...

and

, but especially

excise file:Lincoln Beer Stamp 1871.JPG, upright=1.2, 1871 U.S. Revenue stamp for 1/6 barrel of beer. Brewers would receive the stamp sheets, cut them into individual stamps, cancel them, and paste them over the Bunghole, bung of the beer barrel so when ...

ad valorem An ''ad valorem'' tax (Latin for "according to value") is a tax whose amount is based on the value of a transaction or of property. It is typically imposed at the time of a transaction, as in the case of a sales tax or value-added tax (VAT). An ...

taxes/subsidies, * asymmetric information or

uncertainty Uncertainty refers to epistemic situations involving imperfect or unknown information. It applies to predictions of future events, to physical measurements that are already made, or to the unknown. Uncertainty arises in partially observable ...

among market participants, * any policy or action that restricts information critical to the market, *

, oligopoly, or

monopsony In economics, a monopsony is a market structure in which a single buyer substantially controls the market as the major purchaser of goods and services offered by many would-be sellers. The microeconomic theory of monopsony assumes a single entity ...

powers of market participants, * criminal coercion or subversion of legal contracts, * illiquidity of the market (lack of buyers, sellers, product, or

money Money is any item or verifiable record that is generally accepted as payment for goods and services and repayment of debts, such as taxes, in a particular country or socio-economic context. The primary functions which distinguish money are as ...

), * collusion among market participants, * mass non-rational behavior by market participants, * price supports or subsidies, * failure of government to provide a stable

currency A currency, "in circulation", from la, currens, -entis, literally meaning "running" or "traversing" is a standardization of money in any form, in use or circulation as a medium of exchange, for example banknotes and coins. A more general ...

, * failure of government to enforce the Rule of Law, * failure of government to protect

property rights The right to property, or the right to own property (cf. ownership) is often classified as a human right for natural persons regarding their possessions. A general recognition of a right to private property is found more rarely and is typically h ...

, * failure of government to regulate non-competitive market behavior, * stifling or corrupt

government regulation Regulation is the management of complex systems according to a set of rules and trends. In systems theory, these types of rules exist in various fields of biology and society, but the term has slightly different meanings according to context. For ...

. * nonconvex consumer preference sets * market

* natural factors that impede competition between firms, such as occurs in

land Land, also known as dry land, ground, or earth, is the solid terrestrial surface of the planet Earth that is not submerged by the ocean or other bodies of water. It makes up 29% of Earth's surface and includes the continents and various isla ...

markets

References

Financial markets Economic efficiency {{microeconomics-stub

See also

References