A market is one of the many varieties of systems, procedures, social relations and infrastructures whereby parties engage in exchange. While parties may exchange goods and services by barter, most markets rely on sellers offering their goods or services in exchange for money from buyers, it can be said that a market is the process by which the prices of goods and services are established. Markets facilitate enable the distribution and resource allocation in a society. Markets allow any trade-able item to be priced. A market emerges more or less spontaneously or may be constructed deliberately by human interaction in order to enable the exchange of rights of services and goods. Markets supplant gift economies and are held in place through rules and customs, such as a booth fee, competitive pricing, source of goods for sale. Markets can differ by products or factors sold, product differentiation, place in which exchanges are carried, buyers targeted, selling process, government regulation, subsidies, minimum wages, price ceilings, legality of exchange, intensity of speculation, concentration, exchange asymmetry, relative prices and geographic extension.
The geographic boundaries of a market may vary for example the food market in a single building, the real estate market in a local city, the consumer market in an entire country, or the economy of an international trade bloc where the same rules apply throughout. Markets can be worldwide, see for example the global diamond trade. National economies can be classified as developed markets or developing markets. In mainstream economics, the concept of a market is any structure that allows buyers and sellers to exchange any type of goods and information; the exchange of goods or services, with or without money, is a transaction. Market participants consist of all the buyers and sellers of a good who influence its price, a major topic of study of economics and has given rise to several theories and models concerning the basic market forces of supply and demand. A major topic of debate is how much a given market can be considered to be a "free market", free from government intervention. Microeconomics traditionally focuses on the study of market structure and the efficiency of market equilibrium.
However, it is not always clear how the allocation of resources can be improved since there is always the possibility of government failure. A market is one of the many varieties of systems, procedures, social relations and infrastructures whereby parties engage in exchange. While parties may exchange goods and services by barter, most markets rely on sellers offering their goods or services in exchange for money from buyers, it can be said that a market is the process by which the prices of goods and services are established. Markets enables the distribution and allocation of resources in a society. Markets allow any trade-able item to be priced. A market sometimes emerges more or less spontaneously or may be constructed deliberately by human interaction in order to enable the exchange of rights of services and goods. Markets of varying types can spontaneously arise whenever a party has interest in a good or service that some other party can provide. Hence there can be a market for cigarettes in correctional facilities, another for chewing gum in a playground, yet another for contracts for the future delivery of a commodity.
There can be black markets, where a good is exchanged illegally, for example markets for goods under a command economy despite pressure to repress them and virtual markets, such as eBay, in which buyers and sellers do not physically interact during negotiation. A market can be organized as an auction, as a private electronic market, as a commodity wholesale market, as a shopping center, as a complex institution such as a stock market and as an informal discussion between two individuals. Markets vary in form, scale and types of participants as well as the types of goods and services traded; the following is a non exhaustive list: Food retail markets: farmers' markets, fish markets, wet markets and grocery stores Retail marketplaces: public markets, market squares, Main Streets, High Streets, souqs, night markets, shopping strip malls and shopping malls Big-box stores: supermarkets and discount stores Ad hoc auction markets: process of buying and selling goods or services by offering them up for bid, taking bids and selling the item to the highest bidder Used goods markets such as flea markets Temporary markets such as fairs Physical wholesale markets: sale of goods or merchandise to retailers.
Operations research, or operational research in British usage, is a discipline that deals with the application of advanced analytical methods to help make better decisions. Further, the term operational analysis is used in the British military as an intrinsic part of capability development and assurance. In particular, operational analysis forms part of the Combined Operational Effectiveness and Investment Appraisals, which support British defense capability acquisition decision-making, it is considered to be a sub-field of applied mathematics. The terms management science and decision science are sometimes used as synonyms. Employing techniques from other mathematical sciences, such as mathematical modeling, statistical analysis, mathematical optimization, operations research arrives at optimal or near-optimal solutions to complex decision-making problems; because of its emphasis on human-technology interaction and because of its focus on practical applications, operations research has overlap with other disciplines, notably industrial engineering and operations management, draws on psychology and organization science.
Operations research is concerned with determining the extreme values of some real-world objective: the maximum or minimum. Originating in military efforts before World War II, its techniques have grown to concern problems in a variety of industries. Operational research encompasses a wide range of problem-solving techniques and methods applied in the pursuit of improved decision-making and efficiency, such as simulation, mathematical optimization, queueing theory and other stochastic-process models, Markov decision processes, econometric methods, data envelopment analysis, neural networks, expert systems, decision analysis, the analytic hierarchy process. Nearly all of these techniques involve the construction of mathematical models that attempt to describe the system; because of the computational and statistical nature of most of these fields, OR has strong ties to computer science and analytics. Operational researchers faced with a new problem must determine which of these techniques are most appropriate given the nature of the system, the goals for improvement, constraints on time and computing power.
The major sub-disciplines in modern operational research, as identified by the journal Operations Research, are: Computing and information technologies Financial engineering Manufacturing, service sciences, supply chain management Policy modeling and public sector work Revenue management Simulation Stochastic models Transportation In the decades after the two world wars, the tools of operations research were more applied to problems in business and society. Since that time, operational research has expanded into a field used in industries ranging from petrochemicals to airlines, finance and government, moving to a focus on the development of mathematical models that can be used to analyse and optimize complex systems, has become an area of active academic and industrial research. In the 17th century, mathematicians like Christiaan Huygens and Blaise Pascal tried to solve problems involving complex decisions with probability. Others in the 18th and 19th centuries solved these types of problems with combinatorics.
Charles Babbage's research into the cost of transportation and sorting of mail led to England's universal "Penny Post" in 1840, studies into the dynamical behaviour of railway vehicles in defence of the GWR's broad gauge. Beginning in the 20th century, study of inventory management could be considered the origin of modern operations research with economic order quantity developed by Ford W. Harris in 1913. Operational research may have originated in the efforts of military planners during World War I. Percy Bridgman brought operational research to bear on problems in physics in the 1920s and would attempt to extend these to the social sciences. Modern operational research originated at the Bawdsey Research Station in the UK in 1937 and was the result of an initiative of the station's superintendent, A. P. Rowe. Rowe conceived the idea as a means to analyse and improve the working of the UK's early warning radar system, Chain Home, he analysed the operating of the radar equipment and its communication networks, expanding to include the operating personnel's behaviour.
This allowed remedial action to be taken. Scientists in the United Kingdom including Patrick Blackett, Cecil Gordon, Solly Zuckerman, C. H. Waddington, Owen Wansbrough-Jones, Frank Yates, Jacob Bronowski and Freeman Dyson, in the United States with George Dantzig looked for ways to make better decisions in such areas as logistics and training schedules The modern field of operational research arose during World War II. In the World War II era, operational research was defined as "a scientific method of providing executive departments with a quantitative basis for decisions regarding the operations under their control". Other names for it included quantitative management. During the Second World War close to 1,000 men and women in Britain were engaged in operational research. About 200 operational research scientists worked for the British Army. Patrick Blackett worked for several different organizations during the war. Early in the war while working for the Royal Aircraft Establishment he set up a team known as the "Circus" which helped to reduce the number of anti-aircraft artillery rounds needed to shoot down an enemy aircraft from an
An economist is a practitioner in the social science discipline of economics. The individual may study and apply theories and concepts from economics and write about economic policy. Within this field there are many sub-fields, ranging from the broad philosophical theories to the focused study of minutiae within specific markets, macroeconomic analysis, microeconomic analysis or financial statement analysis, involving analytical methods and tools such as econometrics, economics computational models, financial economics, mathematical finance and mathematical economics; the professionalization of economics, reflected in academia, has been described as "the main change in economics since around 1900." Economists debate the path. It is a debate between a scholastic orientation, focused on mathematical techniques, a public discourse orientation, more focused on communicating to lay people pertinent economic principles as they relate to public policy. Surveys among economists indicate a preference for a shift toward the latter.
Most major universities have an economics faculty, school or department, where academic degrees are awarded in economics. Getting a PhD in economics takes six years, on average, with a median of 5.3 years. The Nobel Memorial Prize in Economics, established by Sveriges Riksbank in 1968, is a prize awarded to economists each year for outstanding intellectual contributions in the field of economics; the prize winners are announced in October every year. They receive their awards on the anniversary of Alfred Nobel's death. Economists work in many fields including academia, government and in the private sector, where they may "...study data and statistics in order to spot trends in economic activity, economic confidence levels, consumer attitudes. They assess this information using advanced methods in statistical analysis, computer programming they make recommendations about ways to improve the efficiency of a system or take advantage of trends as they begin."In contrast to regulated professions such as engineering, law or medicine, there is not a required educational requirement or license for economists.
In academia, to be called an economist requires a Ph. D. degree in Economics. In the US government, on the other hand, a person can be hired as an economist provided that they have a degree that included or was supplemented by 21 semester hours in economics and three hours in statistics, accounting, or calculus. A professional working inside of one of many fields of economics or having an academic degree in this subject is considered to be an economist. In addition to government and academia, economists are employed in banking, accountancy, marketing, business administration and non- or not-for profit organizations. Politicians consult economists before enacting economic policy. Many statesmen have academic degrees in economics. Economics graduates are employable in varying degrees depending on the regional economic scenario and labour market conditions at the time for a given country. Apart from the specific understanding of the subject, employers value the skills of numeracy and analysis, the ability to communicate and the capacity to grasp broad issues which the graduates acquire at the university or college.
Whilst only a few economics graduates may be expected to become professional economists, many find it a base for entry into a career in finance – including accounting, insurance and banking, or management. A number of economics graduates from around the world have been successful in obtaining employment in a variety of major national and international firms in the financial and commercial sectors, in manufacturing, retailing and IT, as well as in the public sector – for example, in the health and education sectors, or in government and politics. Small numbers go on to undertake postgraduate studies, either in economics, teacher training or further qualifications in specialist areas. In Brazil, unlike most countries in the world where the profession is not regulated, the profession of Economist is regulated by Law. 1411 of August 13, 1951. The professional designation of economist, according to the said law, is exclusive to the bachelors in economics graduates in Brazil. According to the United States Department of Labor, there were about 15,000 non-academic economists in the United States in 2008, with a median salary of $83,000 the top ten percent earning more than $147,040 annually.
Nearly 135 colleges and universities grant around 900 new Ph. D.s every year. Incomes are highest for those in the private sector, followed by the federal government, with academia paying the lowest incomes; as of January 2013, PayScale.com showed Ph. D. economists' salary ranges as follows: all Ph. D. economists, $61,000 to $160,000. D. corporate economists, $71,000 to $207,000. The largest single professional grouping of economists in the UK are the more than 1000 members of the Government Economic Service, who work in 30 government departments and agencies. Analysis of destination surveys for economics graduates from a number of selected top schools of economics in the United Kingdom, shows nearly 80 percent in employment six months after graduation – with a wide range of roles and employers, including regional and international organisations, across many sectors; this figure compares favourably with the national picture, with 64 percent of economics graduates in employment. Some current we
Microeconomics is a branch of economics that studies the behaviour 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, it 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 and unemployment and with national policies relating to these issues". Microeconomics deals with the effects of economic policies on microeconomic behavior and thus on the aforementioned aspects of the economy. In the wake of the Lucas critique, much of modern macroeconomic theories has been built upon microfoundations—i.e. Based upon basic assumptions about micro-level behavior.
Microeconomic theory 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, 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 there is no 100% guarantee but there would be a rational rise in individual utility. With the necessary tools and assumptions in place the utility maximization problem 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 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 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 theory of supply and demand assumes that markets are competitive. This implies that there are many buyers and sellers in the market and none of them have the capacity to 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 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, 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 existed. This is studied in the field of public choice theory. "Optimal welfare" takes on a Paretian norm, 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 is limited in implications without mixing the belief of the economist and their theory; the demand for various commodities by individuals is 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. The study of microeconomics involves several "key" areas: Supply and demand is an economic model of price determination in a competitive market.
It concludes that in a 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. Elasticity is the measurement of how resp
Political economy is the study of production and trade and their relations with law and government. As a discipline, political economy originated in moral philosophy, in the 18th century, to explore the administration of states' wealth, with "political" signifying the Greek word polity and "economy" signifying the Greek word "okonomie"; the earliest works of political economy are attributed to the British scholars Adam Smith, Thomas Malthus, David Ricardo, although they were preceded by the work of the French physiocrats, such as François Quesnay and Anne-Robert-Jacques Turgot. In the late 19th century, the term "economics" began to replace the term "political economy" with the rise of mathematical modelling coinciding with the publication of an influential textbook by Alfred Marshall in 1890. Earlier, William Stanley Jevons, a proponent of mathematical methods applied to the subject, advocated economics for brevity and with the hope of the term becoming "the recognised name of a science".
Citation measurement metrics from Google Ngram Viewer indicate that use of the term "economics" began to overshadow "political economy" around 1910, becoming the preferred term for the discipline by 1920. Today, the term "economics" refers to the narrow study of the economy absent other political and social considerations while the term "political economy" represents a distinct and competing approach. Political economy, where it is not used as a synonym for economics, may refer to different things. From an academic standpoint, the term may reference Marxian economics, applied public choice approaches emanating from the Chicago school and the Virginia school. In common parlance, "political economy" may refer to the advice given by economists to the government or public on general economic policy or on specific economic proposals developed by political scientists. A growing mainstream literature from the 1970s has expanded beyond the model of economic policy in which planners maximize utility of a representative individual toward examining how political forces affect the choice of economic policies as to distributional conflicts and political institutions.
It is available as a stand-alone area of study in certain universities. Political economy meant the study of the conditions under which production or consumption within limited parameters was organized in nation-states. In that way, political economy expanded the emphasis of economics, which comes from the Greek oikos and nomos. Political economy was thus meant to express the laws of production of wealth at the state level, just as economics was the ordering of the home; the phrase économie politique first appeared in France in 1615 with the well-known book by Antoine de Montchrétien, Traité de l’economie politique. The French physiocrats were the first exponents of political economy, although the intellectual responses of Adam Smith, John Stuart Mill, David Ricardo, Henry George and Karl Marx to the physiocrats receives much greater attention; the world's first professorship in political economy was established in 1754 at the University of Naples Federico II in southern Italy. The Neapolitan philosopher Antonio Genovesi was the first tenured professor.
In 1763, Joseph von Sonnenfels was appointed a Political Economy chair at the University of Vienna, Austria. Thomas Malthus, in 1805, became England's first professor of political economy, at the East India Company College, Hertfordshire. In its contemporary meaning, political economy refers to different yet related approaches to studying economic and related behaviours, ranging from the combination of economics with other fields to the use of different, fundamental assumptions that challenge earlier economic assumptions: Political economy most refers to interdisciplinary studies drawing upon economics and political science in explaining how political institutions, the political environment, the economic system—capitalist, communist, or mixed—influence each other; the Journal of Economic Literature classification codes associate political economy with three sub-areas: the role of government and/or class and power relationships in resource allocation for each type of economic system. Much of the political economy approach is derived from public choice theory on the one hand and radical political economics on the other hand, both dating from the 1960s.
Public choice theory is a microfoundations theory, intertwined with political economy. Both approaches model voters and bureaucrats as behaving in self-interested ways, in contrast to a view, ascribed to earlier mainstream economists, of government officials trying to maximize individual utilities from some kind of social welfare function; as such and political scientists associate political economy with approaches using rational-choice assumptions in game theory and in examining phenomena beyond economics' standard remit, such as government failure and complex decision making in which context the term "positive political economy" is common. Other "traditional" topics include analysis of such public policy issues as economic regulation, rent-seeking, market protection, institutional corruption and distributional politics. Empirical analysis includes the influence of elections on the choice of economic policy and forecasting models of electoral outcome
Game theory is the study of mathematical models of strategic interaction between rational decision-makers. It has applications in all fields of social science, as well as in computer science, it addressed zero-sum games, in which one person's gains result in losses for the other participants. Today, game theory applies to a wide range of behavioral relations, is now an umbrella term for the science of logical decision making in humans and computers. Modern game theory began with the idea regarding the existence of mixed-strategy equilibria in two-person zero-sum games and its proof by John von Neumann. Von Neumann's original proof used the Brouwer fixed-point theorem on continuous mappings into compact convex sets, which became a standard method in game theory and mathematical economics, his paper was followed by the 1944 book Theory of Games and Economic Behavior, co-written with Oskar Morgenstern, which considered cooperative games of several players. The second edition of this book provided an axiomatic theory of expected utility, which allowed mathematical statisticians and economists to treat decision-making under uncertainty.
Game theory was developed extensively in the 1950s by many scholars. It was explicitly applied to biology in the 1970s, although similar developments go back at least as far as the 1930s. Game theory has been recognized as an important tool in many fields; as of 2014, with the Nobel Memorial Prize in Economic Sciences going to game theorist Jean Tirole, eleven game theorists have won the economics Nobel Prize. John Maynard Smith was awarded the Crafoord Prize for his application of game theory to biology. Early discussions of examples of two-person games occurred long before the rise of modern, mathematical game theory; the first known discussion of game theory occurred in a letter written by Charles Waldegrave, an active Jacobite, uncle to James Waldegrave, a British diplomat, in 1713. In this letter, Waldegrave provides a minimax mixed strategy solution to a two-person version of the card game le Her, the problem is now known as Waldegrave problem. In his 1838 Recherches sur les principes mathématiques de la théorie des richesses, Antoine Augustin Cournot considered a duopoly and presents a solution, a restricted version of the Nash equilibrium.
In 1913, Ernst Zermelo published Über eine Anwendung der Mengenlehre auf die Theorie des Schachspiels. It proved that the optimal chess strategy is determined; this paved the way for more general theorems. In 1938, the Danish mathematical economist Frederik Zeuthen proved that the mathematical model had a winning strategy by using Brouwer's fixed point theorem. In his 1938 book Applications aux Jeux de Hasard and earlier notes, Émile Borel proved a minimax theorem for two-person zero-sum matrix games only when the pay-off matrix was symmetric. Borel conjectured that non-existence of mixed-strategy equilibria in two-person zero-sum games would occur, a conjecture, proved false. Game theory did not exist as a unique field until John von Neumann published the paper On the Theory of Games of Strategy in 1928. Von Neumann's original proof used Brouwer's fixed-point theorem on continuous mappings into compact convex sets, which became a standard method in game theory and mathematical economics, his paper was followed by his 1944 book Theory of Games and Economic Behavior co-authored with Oskar Morgenstern.
The second edition of this book provided an axiomatic theory of utility, which reincarnated Daniel Bernoulli's old theory of utility as an independent discipline. Von Neumann's work in game theory culminated in this 1944 book; this foundational work contains the method for finding mutually consistent solutions for two-person zero-sum games. During the following time period, work on game theory was focused on cooperative game theory, which analyzes optimal strategies for groups of individuals, presuming that they can enforce agreements between them about proper strategies. In 1950, the first mathematical discussion of the prisoner's dilemma appeared, an experiment was undertaken by notable mathematicians Merrill M. Flood and Melvin Dresher, as part of the RAND Corporation's investigations into game theory. RAND pursued the studies because of possible applications to global nuclear strategy. Around this same time, John Nash developed a criterion for mutual consistency of players' strategies, known as Nash equilibrium, applicable to a wider variety of games than the criterion proposed by von Neumann and Morgenstern.
Nash proved that every n-player, non-zero-sum non-cooperative game has what is now known as a Nash equilibrium. Game theory experienced a flurry of activity in the 1950s, during which time the concepts of the core, the extensive form game, fictitious play, repeated games, the Shapley value were developed. In addition, the first applications of game theory to philosophy and political science occurred during this time. In 1979 Robert Axelrod tried setting up computer programs as players and found that in tournaments between them the winner was a simple "tit-for-tat" program that cooperates on the first step on subsequent steps just does whatever its opponent did on the previous step; the same winner was often obtained by natural selection. In 1965, Reinhard Selten introduced his solution concept of subgame perfect equilibria, which further refined the Nash equilibrium. In 1994 Nash and Harsanyi became Economics Nobel Laureates for their contributi
Labour economics seeks to understand the functioning and dynamics of the markets for wage labour. Labour markets or job markets function through the interaction of employers. Labour economics looks at the suppliers of labour services and the demanders of labour services, attempts to understand the resulting pattern of wages and income. Labour is a measure of the work done by human beings, it is conventionally contrasted with such other factors of production as capital. Some theories focus on human capital. There are two sides to labour economics. Labour economics can be seen as the application of microeconomic or macroeconomic techniques to the labour market. Microeconomic techniques study individual firms in the labour market. Macroeconomic techniques look at the interrelations between the labour market, the goods market, the money market, the foreign trade market, it looks at how these interactions influence macro variables such as employment levels, participation rates, aggregate income and gross domestic product.
The labour force is defined as the number of people of working age, who are either employed or looking for work. The participation rate is the number of people in the labour force divided by the size of the adult civilian noninstitutional population; the non-labour force includes those who are not looking for work, those who are institutionalised such as in prisons or psychiatric wards, stay-at home spouses and those serving in the military. The unemployment level is defined as the labour force minus the number of people employed; the unemployment rate is defined as the level of unemployment divided by the labour force. The employment rate is defined as the number of people employed divided by the adult population. In these statistics, self-employed people are counted as employed. Variables like employment level, unemployment level, labour force, unfilled vacancies are called stock variables because they measure a quantity at a point in time, they can be contrasted with flow variables. Changes in the labour force are due to flow variables such as natural population growth, net immigration, new entrants, retirements from the labour force.
Changes in unemployment depend on inflows made up of non-employed people starting to look for jobs and of employed people who lose their jobs and look for new ones, outflows of people who find new employment and of people who stop looking for employment. When looking at the overall macroeconomy, several types of unemployment have been identified, including: Frictional unemployment – This reflects the fact that it takes time for people to find and settle into new jobs. Technological advancement reduces frictional unemployment. Structural unemployment – This reflects a mismatch between the skills and other attributes of the labour force and those demanded by employers. Rapid industry changes of a technical and/or economic nature will increase levels of structural unemployment; the process of globalization has contributed to structural changes in labour markets. Natural rate of unemployment – This is the summation of frictional and structural unemployment, that excludes cyclical contributions of unemployment.
It is the lowest rate of unemployment that a stable economy can expect to achieve, given that some frictional and structural unemployment is inevitable. Economists do not agree on the level of the natural rate, with estimates ranging from 1% to 5%, or on its meaning – some associate it with "non-accelerating inflation"; the estimated rate varies from country from time to time. Demand deficient unemployment – In Keynesian economics, any level of unemployment beyond the natural rate is due to insufficient goods demand in the overall economy. During a recession, aggregate expenditure is deficient causing the underutilisation of inputs. Aggregate expenditure can be increased, according to Keynes, by increasing consumption spending, increasing investment spending, increasing government spending, or increasing the net of exports minus imports, since AE = C + I + G +. Neoclassical economists view the labour market as similar to other markets in that the forces of supply and demand jointly determine price and quantity.
However, the labour market differs from other markets in several ways. In particular, the labour market may act as a non-clearing market. While according to neoclassical theory most markets attain a point of equilibrium without excess supply or demand, this may not be true of the labour market: it may have a persistent level of unemployment. Contrasting the labour market to other markets reveals persistent compensating differentials among similar workers. Models that assume perfect competition in the labour market, as discussed below, conclude that workers earn their marginal product of labour. Households are suppliers of labour. In microeconomic theory, people are assumed to be rational and seeking to maximize their utility function. In the labour market model, their utility function expresses