Microeconomics - Wikipedia Microeconomics Further information : History of microeconomics Part of a series on Economics A supply and demand diagram, illustrating the effects of an increase in demand Index Outline Category History Branches Classification History of economics Schools of economics Mainstream economics Heterodox economics Economic methodology Economic theory Political economy Microeconomics Macroeconomics International economics Applied economics Mathematical economics Econometrics JEL classification codes Concepts Theory Techniques Economic systems Economic growth Market National accounting Experimental economics Computational economics Game theory Operations research By application Agricultural Behavioral Business Cultural Demographic Development Digitization Ecological Education Engineering Environmental Evolutionary Expeditionary Economic geography Financial Health Economic history Industrial organization Information Institutional Knowledge Labour Law Managerial Monetary Natural resource Organizational Personnel Economic planning Economic policy Public economics Public / Social choice Regional Rural Service Socioeconomics Economic sociology Economic statistics Urban Welfare Welfare economics Notable economists François Quesnay Adam Smith David Ricardo Thomas Robert Malthus John Stuart Mill Karl Marx Léon Walras Alfred Marshall John Maynard Keynes Arthur Cecil Pigou Paul Samuelson Lists Economists Publications ( journals ) Glossary Glossary of economics Business and economics portal Microeconomics ( from Greek prefix mikro - meaning `` small '' + economics ) is a branch of economics that studies the behavior of individuals and firms in making decisions regarding the allocation of scarce resources and the interactions among these individuals and firms. One goal of microeconomics is to analyze the market mechanisms that establish relative prices among goods and services and allocate limited resources among alternative uses. Microeconomics shows conditions under which free markets lead to desirable allocations. It also analyzes market failure, where markets fail to produce efficient results. Microeconomics stands in contrast to macroeconomics, which involves `` the sum total of economic activity, dealing with the issues of growth, inflation, and unemployment and with national policies relating to these issues ''. Microeconomics also deals with the effects of economic policies ( such as changing taxation levels ) on the aforementioned aspects of the economy. Particularly in the wake of the Lucas critique, much of modern macroeconomic theory has been built upon microfoundations -- i.e. based upon basic assumptions about micro-level behavior. Contents 1 Assumptions and definitions 2 Basic microeconomic concepts 2.1 Demand, supply, and equilibrium 2.2 Measurement of elasticities 2.3 Consumer demand theory 2.4 Theory of production 2.5 Costs of production 2.6 Opportunity cost 2.7 Market structure 2.8 Perfect competition 2.9 Imperfect competition 2.9. 1 Monopolistic competition 2.9. 2 Monopoly 2.9. 3 Oligopoly 2.9. 4 Monopsony 2.9. 5 Oligopsony 2.10 Game theory 2.11 Labor economics 2.12 Welfare economics 2.13 Economics of information 3 Applied 4 History 5 See also 6 References 7 Further reading 8 External links Assumptions and definitions Microeconomic theory typically begins with the study of a single rational and utility maximizing individual. To economists, rationality means an individual possesses stable preferences that are both complete and transitive. The technical assumption that preference relations are continuous is needed to ensure the existence of a utility function. Although microeconomic theory can continue without this assumption, it would make comparative statics impossible since there is no guarantee that the resulting utility function would be differentiable. Microeconomic theory progresses by defining a competitive budget set which is a subset of the consumption set. It is at this point that economists make The technical assumption that preferences are locally non-satiated. Without the assumption of LNS ( local non-satiation ) there is no guarantee that a rational individual would maximize utility. With the necessary tools and assumptions in place the utility maximization problem ( UMP ) is developed. The utility maximization problem is the heart of consumer theory. The utility maximization problem attempts to explain the action axiom by imposing rationality axioms on consumer preferences and then mathematically modeling and analyzing the consequences. The utility maximization problem serves not only as the mathematical foundation of consumer theory but as a metaphysical explanation of it as well. That is, the utility maximization problem is used by economists to not only explain what or how individuals make choices but why individuals make choices as well. The utility maximization problem is a constrained optimization problem in which an individual seeks to maximize utility subject to a budget constraint. Economists use the extreme value theorem to guarantee that a solution to the utility maximization problem exists. That is, since the budget constraint is both bounded and closed, a solution to the utility maximization problem exists. Economists call the solution to the utility maximization problem a Walrasian demand function or correspondence. The utility maximization problem has so far been developed by taking consumer tastes ( i.e. consumer utility ) as the primitive. However, an alternative way to develop microeconomic theory is by taking consumer choice as the primitive. This model of microeconomic theory is referred to as revealed preference theory. The supply and demand model describes how prices vary as a result of a balance between product availability at each price ( supply ) and the desires of those with purchasing power at each price ( demand ). The graph depicts a right - shift in demand from D to D along with the consequent increase in price and quantity required to reach a new market - clearing equilibrium point on the supply curve ( S ). The theory of supply and demand usually assumes that markets are perfectly competitive. This implies that there are many buyers and sellers in the market and none of them have the capacity to significantly influence prices of goods and services. In many real - life transactions, the assumption fails because some individual buyers or sellers have the ability to influence prices. Quite often, a sophisticated analysis is required to understand the demand - supply equation of a good model. However, the theory works well in situations meeting these assumptions. Mainstream economics does not assume a priori that markets are preferable to other forms of social organization. In fact, much analysis is devoted to cases where market failures lead to resource allocation that is suboptimal and creates deadweight loss. A classic example of suboptimal resource allocation is that of a public good. In such cases, economists may attempt to find policies that avoid waste, either directly by government control, indirectly by regulation that induces market participants to act in a manner consistent with optimal welfare, or by creating `` missing markets '' to enable efficient trading where none had previously existed. This is studied in the field of collective action and public choice theory. `` Optimal welfare '' usually takes on a Paretian norm, which is a mathematical application of the Kaldor -- Hicks method. This can diverge from the Utilitarian goal of maximizing utility because it does not consider the distribution of goods between people. Market failure in positive economics ( microeconomics ) is limited in implications without mixing the belief of the economist and their theory. The demand for various commodities by individuals is generally thought of as the outcome of a utility - maximizing process, with each individual trying to maximize their own utility under a budget constraint and a given consumption set. Basic microeconomic concepts The study of microeconomics involves several `` key '' areas : Demand, supply, and equilibrium Main article : Supply and demand Supply and demand is an economic model of price determination in a perfectly competitive market. It concludes that in a perfectly competitive market with no externalities, per unit taxes, or price controls, the unit price for a particular good is the price at which the quantity demanded by consumers equals the quantity supplied by producers. This price results in a stable economic equilibrium. Measurement of elasticities Main article : Elasticity ( economics ) Elasticity is the measurement of how responsive an economic variable is to a change in another variable. Elasticity can be quantified as the ratio of the change in one variable to the change in another variable, when the later variable has a causal influence on the former. It is a tool for measuring the responsiveness of a variable, or of the function that determines it, to changes in causative variables in unitless ways. Frequently used elasticities include price elasticity of demand, price elasticity of supply, income elasticity of demand, elasticity of substitution or constant elasticity of substitution between factors of production and elasticity of intertemporal substitution. Consumer demand theory Main article : Consumer choice Consumer demand theory relates preferences for the consumption of both goods and services to the consumption expenditures ; ultimately, this relationship between preferences and consumption expenditures is used to relate preferences to consumer demand curves. The link between personal preferences, consumption and the demand curve is one of the most closely studied relations in economics. It is a way of analyzing how consumers may achieve equilibrium between preferences and expenditures by maximizing utility subject to consumer budget constraints. Theory of production Main article : Production theory Production theory is the study of production, or the economic process of converting inputs into outputs. Production uses resources to create a good or service that is suitable for use, gift - giving in a gift economy, or exchange in a market economy. This can include manufacturing, storing, shipping, and packaging. Some economists define production broadly as all economic activity other than consumption. They see every commercial activity other than the final purchase as some form of production. Costs of production Main article : Cost - of - production theory of value The cost - of - production theory of value states that the price of an object or condition is determined by the sum of the cost of the resources that went into making it. The cost can comprise any of the factors of production : labour, capital, land, entrepreneur. Technology can be viewed either as a form of fixed capital ( e.g. plant ) or circulating capital ( e.g. intermediate goods ). Opportunity cost Main article : Opportunity cost The economic idea of opportunity cost is closely related to the idea of time constraints. You can do only one thing at a time, which means that, inevitably, you 're always giving up other things. The opportunity cost of any activity is the value of the next - best alternative thing you may have done instead. Opportunity cost depends only on the value of the next - best alternative. It does n't matter whether you have 5 alternatives or 5,000. Opportunity costs can tell you when not to do something as well as when to do something. For example, you may like waffles, but you like chocolate even more. If someone offers you only waffles, you 're going to take it. But if you 're offered waffles or chocolate, you 're going to take the chocolate. The opportunity cost of eating waffles is sacrificing the chance to eat chocolate. Because the cost of not eating the chocolate is higher than the benefits of eating the waffles, it makes no sense to choose waffles. Of course, if you choose chocolate, you 're still faced with the opportunity cost of giving up having waffles. But you 're willing to do that because the waffle 's opportunity cost is lower than the benefits of the chocolate. Opportunity costs are unavoidable constraints on behaviour because you have to decide what 's best and give up the next - best alternative. Market structure Main article : Market structure This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. ( October 2018 ) The market structure can have several types of interacting market systems. Different forms of markets are a feature of capitalism and market socialism, with advocates of state socialism often criticizing markets and aiming to substitute or replace markets with varying degrees of government - directed economic planning. Competition acts as a regulatory mechanism for market systems, with government providing regulations where the market can not be expected to regulate itself. One example of this is with regards to building codes, which if absent in a purely competition regulated market system, might result in several horrific injuries or deaths to be required before companies would begin improving structural safety, as consumers may at first not be as concerned or aware of safety issues to begin putting pressure on companies to provide them, and companies would be motivated not to provide proper safety features due to how it would cut into their profits. Some examples of markets : commodity markets insurance markets bond markets energy markets flea markets debt markets stock markets online auctions media exchange markets real - estate market. Perfect competition Main article : Perfect competition Perfect competition is a situation in which numerous small firms producing identical products compete against each other in a given industry. Perfect competition leads to firms producing the socially optimal output level at the minimum possible cost per unit. Firms in perfect competition are `` price takers '' ( they do not have enough market power to profitably increase the price of their goods or services ). A good example would be that of digital marketplaces, such as eBay, on which many different sellers sell similar products to many different buyers. Imperfect competition Main article : Imperfect competition In economic theory, imperfect competition is a type of market structure showing some but not all features of competitive markets. Monopolistic competition Main article : Monopolistic competition Monopolistic competition is a situation in which many firms with slightly different products compete. Production costs are above what may be achieved by perfectly competitive firms, but society benefits from the product differentiation. Examples of industries with market structures similar to monopolistic competition include restaurants, cereal, clothing, shoes, and service industries in large cities. Monopoly Main article : monopoly A monopoly is a market structure in which a market or industry is dominated by a single supplier of a particular good or service. Because monopolies have no competition they tend to sell goods and services at a higher price and produce below the socially optimal output level. Although not all monopolies are a bad thing, especially in industries where multiple firms would result in more problems than benefits ( i.e. natural monopolies ). Natural monopoly : A monopoly in an industry where one producer can produce output at a lower cost than many small producers. Oligopoly Main article : Oligopoly An oligopoly is a market structure in which a market or industry is dominated by a small number of firms ( oligopolists ). Oligopolies can create the incentive for firms to engage in collusion and form cartels that reduce competition leading to higher prices for consumers and less overall market output. Alternatively, oligopolies can be fiercely competitive and engage in flamboyant advertising campaigns. Duopoly : A special case of an oligopoly, with only two firms. Game theory can elucidate behavior in duopolies and oligopolies. Monopsony Main article : Monopsony A monopsony is a market where there is only one buyer and many sellers. Oligopsony Main article : Oligopsony An oligopsony is a market where there are a few buyers and many sellers. Game theory Main article : Game theory Game theory is a major method used in mathematical economics and business for modeling competing behaviors of interacting agents. The term `` game '' here implies the study of any strategic interaction between people. Applications include a wide array of economic phenomena and approaches, such as auctions, bargaining, mergers & acquisitions pricing, fair division, duopolies, oligopolies, social network formation, agent - based computational economics, general equilibrium, mechanism design, and voting systems, and across such broad areas as experimental economics, behavioral economics, information economics, industrial organization, and political economy. Labor economics Main article : Labor economics Labor economics seeks to understand the functioning and dynamics of the markets for wage labor. Labor markets function through the interaction of workers and employers. Labor economics looks at the suppliers of labor services ( workers ), the demands of labor services ( employers ), and attempts to understand the resulting pattern of wages, employment, and income. In economics, labor is a measure of the work done by human beings. It is conventionally contrasted with such other factors of production as land and capital. There are theories which have developed a concept called human capital ( referring to the skills that workers possess, not necessarily their actual work ), although there are also counter posing macro-economic system theories that think human capital is a contradiction in terms. Welfare economics Main article : Welfare economics Welfare economics is a branch of economics that uses microeconomics techniques to evaluate well - being from allocation of productive factors as to desirability and economic efficiency within an economy, often relative to competitive general equilibrium. It analyzes social welfare, however measured, in terms of economic activities of the individuals that compose the theoretical society considered. Accordingly, individuals, with associated economic activities, are the basic units for aggregating to social welfare, whether of a group, a community, or a society, and there is no `` social welfare '' apart from the `` welfare '' associated with its individual units. Economics of information Main article : Information economics Information economics or the economics of information is a branch of microeconomic theory that studies how information and information systems affect an economy and economic decisions. Information has special characteristics. It is easy to create but hard to trust. It is easy to spread but hard to control. It influences many decisions. These special characteristics ( as compared with other types of goods ) complicate many standard economic theories. Applied United States Capitol Building : meeting place of the United States Congress, where many tax laws are passed, which directly impact economic welfare. This is studied in the subject of public economics. Applied microeconomics includes a range of specialized areas of study, many of which draw on methods from other fields. Industrial organization examines topics such as the entry and exit of firms, innovation, and the role of trademarks. Labor economics examines wages, employment, and labor market dynamics. Financial economics examines topics such as the structure of optimal portfolios, the rate of return to capital, econometric analysis of security returns, and corporate financial behavior. Public economics examines the design of government tax and expenditure policies and economic effects of these policies ( e.g., social insurance programs ). Political economy examines the role of political institutions in determining policy outcomes. Health economics examines the organization of health care systems, including the role of the health care workforce and health insurance programs. Education economics examines the organization of education provision and its implication for efficiency and equity, including the effects of education on productivity. Urban economics, which examines the challenges faced by cities, such as sprawl, air and water pollution, traffic congestion, and poverty, draws on the fields of urban geography and sociology. Law and economics applies microeconomic principles to the selection and enforcement of competing legal regimes and their relative efficiencies. Economic history examines the evolution of the economy and economic institutions, using methods and techniques from the fields of economics, history, geography, sociology, psychology, and political science. History Main article : History of microeconomics The difference between microeconomics and macroeconomics was introduced in 1933 by the Norwegian economist Ragnar Frisch ( Nobel Prize 1969 ). See also Economics Macroeconomics References Jump up ^ Marchant, Mary A. ; Snell, William M. `` Macroeconomic and International Policy Terms '' ( PDF ). University of Kentucky. Archived ( PDF ) from the original on 2007 - 03 - 18. Retrieved 2007 - 05 - 04. ^ Jump up to : `` Economics Glossary ''. Monroe County Women 's Disability Network. Archived from the original on 2008 - 02 - 04. Retrieved 2008 - 02 - 22. Jump up ^ `` Social Studies Standards Glossary ''. New Mexico Public Education Department. Archived from the original on 2007 - 08 - 08. Retrieved 2008 - 02 - 22. Jump up ^ `` Glossary ''. ECON100. Archived from the original on 2006 - 04 - 11. Retrieved 2008 - 02 - 22. Jump up ^ `` Monopoly - Economics Help ''. Economics Help. Archived from the original on 2018 - 03 - 14. Retrieved 2018 - 03 - 14. Jump up ^ `` Competition Counts ''. ftc.gov. 11 June 2013. Archived from the original on 4 December 2013. Retrieved 6 May 2018. Jump up ^ `` Oligopoly / Duopoly and Game Theory ''. AP Microeconomics Review. 2017. Archived from the original on 2016 - 06 - 25. Retrieved 2017 - 06 - 11. Game theory is the main way economists ( sic ) understands the behavior of firms within this market structure. Jump up ^ Deardorff 's Glossary of International Economics ( 2006 ). `` Welfare economics. '' Archived 2017 - 03 - 20 at the Wayback Machine. Jump up ^ Beth Allen, 1990. `` Information as an Economic Commodity, '' American Economic Review, 80 ( 2 ), pp. 268 -- 273. Kenneth J. Arrow, 1999. `` Information and the Organization of Industry, '' ch. 1, in Graciela Chichilnisky Markets, Information, and Uncertainty. Cambridge University Press, pp. 20 -- 21. _____, 1996. `` The Economics of Information : An Exposition, '' Empirica, 23 ( 2 ), pp. 119 -- 128. _____, 1984. Collected Papers of Kenneth J. Arrow, v. 4, The Economics of Information. Description Archived 2012 - 03 - 30 at the Wayback Machine. and chapter - preview links. Jean - Jacques Laffont, 1989. The Economics of Uncertainty and Information, MIT Press. Description Archived 2012 - 01 - 25 at the Wayback Machine. and chapter - preview links. Further reading Bade, Robin ; Michael Parkin ( 2001 ). Foundations of Microeconomics. Addison Wesley Paperback 1st Edition. Editors, biography.com ( August 17, 2016 ). `` Adam Smith Biography.com ''. A&E Television Networks. Bouman, John : Principles of Microeconomics -- free fully comprehensive Principles of Microeconomics and Macroeconomics texts. Columbia, Maryland, 2011 Colander, David. Microeconomics. McGraw - Hill Paperback, 7th Edition : 2008. Dunne, Timothy ; J. Bradford Jensen ; Mark J. Roberts ( 2009 ). Producer Dynamics : New Evidence from Micro Data. University of Chicago Press. ISBN 978 - 0 - 226 - 17256 - 9. Eaton, B. Curtis ; Eaton, Diane F. ; and Douglas W. Allen. Microeconomics. Prentice Hall, 5th Edition : 2002. Frank, Robert H. ; Microeconomics and Behavior. McGraw - Hill / Irwin, 6th Edition : 2006. Friedman, Milton. Price Theory. Aldine Transaction : 1976 Hagendorf, Klaus : Labour Values and the Theory of the Firm. Part I : The Competitive Firm. Paris : EURODOS ; 2009. Harnerger, Arnold C. ( 2008 ). `` Microeconomics ''. In David R. Henderson ( ed. ). Concise Encyclopedia of Economics ( 2nd ed. ). Indianapolis : Library of Economics and Liberty. ISBN 978 - 0 - 86597 - 665 - 8. OCLC 237794267. CS1 maint : Extra text : editors list ( link ) Hicks, John R. Value and Capital. Clarendon Press. ( 1939 ) 1946, 2nd ed. Hirshleifer, Jack., Glazer, Amihai, and Hirshleifer, David, Price theory and applications : Decisions, markets, and information. Cambridge University Press, 7th Edition : 2005. Jehle, Geoffrey A. ; and Philip J. Reny. Advanced Microeconomic Theory. Addison Wesley Paperback, 2nd Edition : 2000. Katz, Michael L. ; and Harvey S. Rosen. Microeconomics. McGraw - Hill / Irwin, 3rd Edition : 1997. Kreps, David M. A Course in Microeconomic Theory. Princeton University Press : 1990 Landsburg, Steven. Price Theory and Applications. South - Western College Pub, 5th Edition : 2001. Mankiw, N. Gregory. Principles of Microeconomics. South - Western Pub, 2nd Edition : 2000. Mas - Colell, Andreu ; Whinston, Michael D. ; and Jerry R. Green. Microeconomic Theory. Oxford University Press, US : 1995. McGuigan, James R. ; Moyer, R. Charles ; and Frederick H. Harris. Managerial Economics : Applications, Strategy and Tactics. South - Western Educational Publishing, 9th Edition : 2001. Nicholson, Walter. Microeconomic Theory : Basic Principles and Extensions. South - Western College Pub, 8th Edition : 2001. Perloff, Jeffrey M. Microeconomics. Pearson -- Addison Wesley, 4th Edition : 2007. Perloff, Jeffrey M. Microeconomics : Theory and Applications with Calculus. Pearson -- Addison Wesley, 1st Edition : 2007 Pindyck, Robert S. ; and Daniel L. Rubinfeld. Microeconomics. Prentice Hall, 7th Edition : 2008. Ruffin, Roy J. ; and Paul R. Gregory. Principles of Microeconomics. Addison Wesley, 7th Edition : 2000. Varian, Hal R. ( 1987 ). `` microeconomics, '' The New Palgrave : A Dictionary of Economics, v. 3, pp. 461 -- 63. Varian, Hal R. Intermediate Microeconomics : A Modern Approach. W.W. Norton & Company, 8th Edition : 2009. Varian, Hal R. Microeconomic Analysis. W.W. Norton & Company, 3rd Edition : 1992. External links Wikibooks has a book on the topic of : Microeconomics Library resources about Microeconomics Resources in your library X-Lab : A Collaborative Micro-Economics and Social Sciences Research Laboratory Simulations in Microeconomics http://media.lanecc.edu/users/martinezp/201/MicroHistory.html -- a brief history of microeconomics Microeconomics Major topics Aggregation Budget set Consumer choice Convexity and non-convexity Cost Average Marginal Opportunity Social Sunk Transaction Cost -- benefit analysis Deadweight loss Distribution Economies of scale Economies of scope Elasticity Equilibrium General Exchange Externality Firms Household Income -- consumption curve Information Indifference curve Intertemporal choice Market Market failure Market structure Competition Monopolistic Perfect Duopoly Monopoly Bilateral Monopsony Oligopoly Oligopsony Pareto efficiency Preferences Price Production Profit Public goods Rationing Rent Returns to scale Risk aversion Scarcity Shortage Substitution effect Surplus Social choice Supply & demand Uncertainty Utility Expected Marginal Wage Subfields Behavioral Business Computational Statistical decision theory Econometrics Engineering Experimental Game theory Industrial organization Labor Managerial Mathematical Microfoundations of macroeconomics Operations research Optimization Welfare Economics Economic theory Political economy Applied economics Methodology Economic systems Microfoundations Mathematical economics Econometrics Computational economics Experimental economics Publications Microeconomics Aggregation problem Budget set Consumer choice Convexity Cost Average Marginal Opportunity Social Sunk Transaction Cost -- benefit analysis Deadweight loss Distribution Economies of scale Economies of scope Elasticity Equilibrium General Externality Firm Indifference curve Interest Intertemporal choice Market Market failure Market structure Competition Monopolistic Perfect Monopoly Bilateral Monopsony Oligopoly Oligopsony Non-convexity Pareto efficiency Preference Price Production set Profit Public good Rate of profit Rationing Rent Returns to scale Risk aversion Scarcity Shortage Surplus Social choice Supply and demand Trade Uncertainty Utility Expected Marginal Value Wage Publications Macroeconomics Aggregate demand Balance of payments Business cycle Capacity utilization Capital flight Central bank Consumer confidence Currency Deflation Demand for money Demand shock Depression Great DSGE Effective demand Expectations Adaptive Rational Fiscal policy General Theory of Keynes Growth Indicators Inflation Hyperinflation Interest rate Investment IS -- LM model Measures of national income and output Monetary policy Money Money supply NAIRU National accounts Price level PPP Recession Saving Shrinkflation Stagflation Supply shock Unemployment Publications Mathematical economics Operations research Econometrics Decision theory Game theory Mechanism design Input -- output model Mathematical finance Applied fields Agricultural Business Demographic Development Economic geography Economic history Education Engineering Environmental Financial Health Industrial organization International Knowledge Labour Law and economics Monetary Natural resource Economic planning Economic policy Public economics Public choice Regional Service Socioeconomics Economic sociology Economic statistics Transportation Urban Welfare Schools of economic thought Ancient economic thought Anarchist Mutualism Austrian Behavioral Buddhist Chicago Classical Ecological Evolutionary Feminist Georgism Heterodox Historical Institutional Keynesian Neo New Post Mainstream Malthusianism Marxian Neo Mercantilism Neoclassical Lausanne Marginalism New classical Real business - cycle theory New institutional Physiocracy Socialist Stockholm Supply - side Thermoeconomics Notable economists and thinkers within economics Kenneth Arrow Gary Becker Francis Ysidro Edgeworth Milton Friedman Ragnar Frisch Friedrich Hayek Harold Hotelling John Maynard Keynes Tjalling Koopmans Paul Krugman Robert Lucas Jr. Jacob Marschak Alfred Marshall Karl Marx John von Neumann Vilfredo Pareto David Ricardo Paul Samuelson Joseph Schumpeter Amartya Sen Herbert A. 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Question: which field of economics studies how the number of firms effects
Answer: Microeconomics