The Austrian School is a school of economic thought that is based on the concept of methodological individualism – that social phenomena result from the motivations and actions of individuals. It originated in the late-19th and early-20th century Vienna with the work of Carl Menger, Eugen Böhm von Bawerk, Friedrich von Wieser, and others. It was methodologically opposed to the Prussian Historical School (a dispute known as Methodenstreit). Current-day economists working in this tradition are located in many different countries, but their work is referred to as Austrian economics.Among the theoretical contributions of the early years of the Austrian School are the subjective theory of value, marginalism in price theory, and the formulation of the economic calculation problem, each of which has become an accepted part of mainstream economics.Many economists are critical of the current-day Austrian School and consider its rejection of econometrics and aggregate macroeconomic analysis to be outside of mainstream economic theory, or "heterodox." Austrians are likewise critical of mainstream economics. Although the Austrian School has been considered heterodox since the late 1930s, it began to attract renewed academic and public interest starting in the 1970s.The Austrian School theorizes that the subjective choices of individuals including individual knowledge, time, expectation, and other subjective factors, cause all economic phenomena. Austrians seek to understand economy by examining the social ramifications of individual choice, an approach called methodological individualism. It differs from other schools of economic thought, which have focused on aggregate variables, equilibrium analysis, and societal groups rather than individuals.In the twentieth and twenty-first centuries, economists with a methodological lineage to the early Austrian School developed many diverse approaches and theoretical orientations. For example, in 1949, Ludwig von Mises organized his version of the subjectivist approach, which he called "praxeology", in a book published in English as Human Action.:3 In it, Mises stated that praxeology could be used to deduce a priori theoretical economic truths and that deductive economic thought experiments could yield conclusions which follow irrefutably from the underlying assumptions. He claimed conclusions could not be inferred from empirical observation or statistical analysis and argued against the use of probabilities in economic models.Since Mises' time, some Austrian thinkers have accepted his praxeological approach, while others have adopted alternative methodologies. For example, Fritz Machlup, Friedrich Hayek, and others, did not take Mises' strong a priori approach to economics.:225–235 Ludwig Lachmann, a radical subjectivist, also largely rejected Mises' formulation of Praxeology in favor of the verstehende Methode (interpretive method) articulated by Max Weber.In the 20th century, various Austrians incorporated models and mathematics into their analysis. Austrian economist Steven Horwitz argued in 2000, that Austrian methodology is consistent with macroeconomics and that Austrian macroeconomics can be expressed in terms of microeconomic foundations. Austrian economist Roger Garrison claims that Austrian macroeconomic theory can be correctly expressed in terms of diagrammatic models. In 1944, Austrian economist Oskar Morgenstern presented a rigorous schematization of an ordinal utility function (the Von Neumann–Morgenstern utility theorem) in Theory of Games and Economic Behavior.Fritz Machlup listed the typical views of Austrian economic thinking.Two important tenets held by the Misesian branch of Austrian economics may also be added to the list:The opportunity cost doctrine was first explicitly formulated by the Austrian economist Friedrich von Wieser in the late 19th century. Opportunity cost is the cost of any activity measured in terms of the value of the next best alternative foregone (that is not chosen). It is the sacrifice related to the second best choice available to someone, or group, who has picked among several mutually exclusive choices.Opportunity cost is a key concept in mainstream economics, and has been described as expressing "the basic relationship between scarcity and choice". The notion of opportunity cost plays a crucial part in ensuring that resources are used efficiently.The Austrian theory of capital and interest was first developed by Eugen Böhm von Bawerk. He stated that interest rates and profits are determined by two factors, namely, supply and demand in the market for final goods and time preference.Böhm-Bawerk's theory was a response to Marx's labor theory of value and capital. Böhm-Bawerk's theory attacked the viability of the labor theory of value in the light of the transformation problem. His conception of interest countered Marx's exploitation theory. Marx famously argued that capitalists exploit workers by paying them less than the fruits of their labor sell for. Bohm-Bawerk countered this claim by invoking the concept of time preference to demonstrate that everyone values present consumption more than future consumption, and therefore that a difference between the (smaller) salary laborers are paid in the present and the (greater) price for which the goods they produce are later sold need not be exploitative.Böhm-Bawerk's theory equates capital intensity with the degree of roundaboutness of production processes. Böhm-Bawerk also argued that the law of marginal utility necessarily implies the classical law of costs. Some Austrian economists therefore entirely reject the notion that interest rates are affected by liquidity preference.In Mises's definition, inflation is an increase in the supply of money:In theoretical investigation there is only one meaning that can rationally be attached to the expression Inflation: an increase in the quantity of money (in the broader sense of the term, so as to include fiduciary media as well), that is not offset by a corresponding increase in the need for money (again in the broader sense of the term), so that a fall in the objective exchange-value of money must occur.Hayek pointed out that inflationary stimulation exploits the lag between an increase in money supply and the consequent increase in the prices of goods and services:And since any inflation, however modest at first, can help employment only so long as it accelerates, adopted as a means of reducing unemployment, it will do so for any length of time only while it accelerates. "Mild" steady inflation cannot help—it can lead only to outright inflation. That inflation at a constant rate soon ceases to have any stimulating effect, and in the end merely leaves us with a backlog of delayed adaptations, is the conclusive argument against the "mild" inflation represented as beneficial even in standard economics textbooks.The economic calculation problem refers to a criticism of socialism which was first stated by Max Weber in 1920. Mises subsequently discussed Weber's idea with his student Friedrich Hayek, who developed it in various works including The Road to Serfdom. The problem concerns the means by which resources are allocated and distributed in an economy.Austrian theory emphasizes the organizing power of markets. Hayek stated that market prices reflect information, the totality of which is not known to any single individual, which determines the allocation of resources in an economy. Because socialist systems lack the individual incentives and price discovery processes by which individuals act on their personal information, Hayek argued that socialist economic planners lack all of the knowledge required to make optimal decisions. Those who agree with this criticism view it as a refutation of socialism showing that socialism is not a viable or sustainable form of economic organization. The debate rose to prominence in the 1920s and 1930s, and that specific period of the debate has come to be known by historians of economic thought as The Socialist Calculation Debate.Mises argued in a 1920 essay "Economic Calculation in the Socialist Commonwealth" that the pricing systems in socialist economies were necessarily deficient because if government owned the means of production, then no prices could be obtained for capital goods as they were merely internal transfers of goods in a socialist system and not "objects of exchange," unlike final goods. Therefore, they were unpriced and hence the system would be necessarily inefficient since the central planners would not know how to allocate the available resources efficiently. This led him to write "that rational economic activity is impossible in a socialist commonwealth."The Austrian theory of the business cycle ("ABCT") focuses on banks' issuance of credit as the cause of economic fluctuations. Although later elaborated by Hayek and others, the theory was first set forth by Mises, who believed that banks extend credit at artificially low interest rates, causing businesses to invest in relatively roundabout production processes. Mises stated that this led to a misallocation of resources which he called malinvestment.According to the theory, malinvestment is induced by banks' excessive and unsustainable expansion of credit to businesses. Businesses borrow at unsustainably low interest rates and overinvest in capital-intensive production processes, which in turn leads to a diversion of investment from consumer goods industries to capital goods industries. Austrians contend that this shift is unsustainable and must eventually be reversed, and that the re-adjustment process will be more violent and disruptive the longer the putative malinvestment in capital goods industries continues.According to the Austrian view, the proportion of income allocated to consumption rather than saving is determined by the interest rate and people's time preference, which is the degree to which they prefer present to future satisfactions. According to this view, the pure interest rate is determined by the time preferences of the individuals in society. If the market rate of interest offered by banks is set lower than this, business borrowing will be excessive and will be allocated to malinvestment.Newly extended credit thus malinvested will circulate from the business borrowers to the factors of production: landowners, capital goods producers, and capital goods workers. Austrians state that, because individuals' time preferences have not changed, the market will tend to reestablish the old proportions between current and future production. Depositors will tend to remove cash from the banking system and spend it (not save it), banks will then ask their borrowers for repayment, and the excessive capital goods will be liquidated at lower prices to retire the now-unprofitable loans.According to Mises, central banks enable the commercial banks to fund loans at artificially low interest rates, thereby inducing an unsustainable expansion of bank credit and impeding any subsequent contraction.  Friedrich Hayek disagreed. Prior to the 1970s, Hayek did not favor laissez-faire in banking and said that a freely competitive banking industry tends to be endogenously destabilizing and pro-cyclical, mimicking the effects which Rothbard attributed to central bank policy. Hayek stated that the need for central banking control was inescapable.The Austrian School owes its name to members of the German Historical school of economics, who argued against the Austrians during the late-19th century Methodenstreit ("methodology struggle"), in which the Austrians defended the role of theory in economics as distinct from the study or compilation of historical circumstance. In 1883, Menger published Investigations into the Method of the Social Sciences with Special Reference to Economics, which attacked the methods of the Historical school. Gustav von Schmoller, a leader of the Historical school, responded with an unfavorable review, coining the term "Austrian School" in an attempt to characterize the school as outcast and provincial. The label endured and was adopted by the adherents themselves.The school originated in Vienna, in the Austrian Empire. Carl Menger's 1871 book, Principles of Economics, is generally considered the founding of the Austrian School. The book was one of the first modern treatises to advance the theory of marginal utility. The Austrian School was one of three founding currents of the marginalist revolution of the 1870s, with its major contribution being the introduction of the subjectivist approach in economics.[page needed] While marginalism was generally influential, there was also a more specific school that began to coalesce around Menger's work, which came to be known as the “Psychological School,” “Vienna School,” or “Austrian School.”Menger's contributions to economic theory were closely followed by those of Böhm-Bawerk and Friedrich von Wieser. These three economists became what is known as the "first wave" of the Austrian School. Böhm-Bawerk wrote extensive critiques of Karl Marx in the 1880s and 1890s, as was part of the Austrians' participation in the late 19th-century Methodenstreit, during which they attacked the Hegelian doctrines of the Historical School.Several important Austrian economists trained at the University of Vienna in the 1920s and later participated in the private seminar of Mises. These included Gottfried Haberler, Friedrich Hayek, Fritz Machlup, Karl Menger (son of Carl Menger), Oskar Morgenstern, Paul Rosenstein-Rodan Abraham Wald, among others.By the mid-1930s, most economists had embraced what they considered the important contributions of the early Austrians. After World War II, Austrian economics was disregarded or derided by most economists because it rejected mathematical and statistical methods in the study of economics. Fritz Machlup quoted Hayek's statement, "the greatest success of a school is that it stops existing because its fundamental teachings have become parts of the general body of commonly accepted thought."  Mises' student, Israel Kirzner recalled that in 1954, when Kirzner was pursuing his PhD, there was no separate Austrian School as such. When Kirzner was deciding which graduate school to attend, Mises had advised him to accept an offer of admission at Johns Hopkins because it was a prestigious university and Fritz Machlup taught there.After 1940, Austrian economics can be divided into two schools of economic thought, and the school "split" to some degree in the late 20th century. One camp of Austrians, exemplified by Mises, regards neoclassical methodology to be irredeemably flawed; the other camp, exemplified by Friedrich Hayek, accepts a large part of neoclassical methodology and is more accepting of government intervention in the economy.Henry Hazlitt wrote economics columns and editorials for a number of publications and wrote many books on the topic of Austrian economics from the 1930s to the 1980s. Hazlitt's thinking was influenced by Mises. His book Economics in One Lesson (1946) sold over a million copies, and he is also known for The Failure of the "New Economics" (1959), a line-by-line critique of John Maynard Keynes's General Theory.The reputation of the Austrian School rose in the late-20th century due in part to the work of Israel Kirzner and Ludwig Lachmann at New York University, and to renewed public awareness of the work of Hayek after he won the 1974 Nobel Memorial Prize in Economic Sciences. Hayek's work was influential in the revival of laissez-faire thought in the 20th century.According to economist Bryan Caplan, by the late twentieth century, a split had developed among those who self-identify with the Austrian School. One group, building on the work of Hayek, follows the broad framework of mainstream neoclassical economics, including its use of mathematical models and general equilibrium, and brings a critical perspective to mainstream methodology merely influenced by the Austrian notions such as the economic calculation problem and the independent role of logical reasoning in developing economic theory.A second group, following Mises and Rothbard, rejects the neoclassical theories of consumer and welfare economics, dismisses empirical methods and mathematical and statistical models as inapplicable to economic science, and asserts that economic theory went entirely astray in the twentieth century; they offer the Misesian view as a radical alternative paradigm to mainstream theory. Caplan wrote that if "Mises and Rothbard are right, then [mainstream] economics is wrong; but if Hayek is right, then mainstream economics merely needs to adjust its focus."Economist Leland Yeager discussed the late twentieth century rift and referred to a discussion written by Murray Rothbard, Hans-Hermann Hoppe, Joseph Salerno, and others in which they attack and disparage Hayek. "To try to drive a wedge between Mises and Hayek on [the role of knowledge in economic calculation], especially to the disparagement of Hayek, is unfair to these two great men, unfaithful to the history of economic thought" and went on to call the rift subversive to economic analysis and the historical understanding of the fall of Eastern European communism.In a 1999 book published by the Ludwig von Mises Institute (Mises Institute), Hans-Hermann Hoppe asserted that Murray Rothbard was the leader of the "mainstream within Austrian Economics" and contrasted Rothbard with Nobel Laureate Friedrich Hayek, whom he identified as a British empiricist and an opponent of the thought of Mises and Rothbard. Hoppe acknowledged that Hayek was the most prominent Austrian economist within academia, but stated that Hayek was an opponent of the Austrian tradition which led from Carl Menger and Böhm-Bawerk through Mises to Rothbard. Austrian economist Walter Block says that the "Austrian school" can be distinguished from other schools of economic thought through two categories – economic theory and political theory. According to Block, while Hayek can be considered an "Austrian economist", his views on political theory clash with the libertarian political theory which Block sees as an integral part of the Austrian school.Economists of the Hayekian view are affiliated with the Cato Institute, George Mason University (GMU), and New York University, among other institutions. They include Peter Boettke, Roger Garrison, Steven Horwitz, Peter Leeson and George Reisman. Economists of the Mises-Rothbard view include Walter Block, Hans-Hermann Hoppe, Jesús Huerta de Soto and Robert P. Murphy, each of whom is associated with the Mises Institute and some of them also with academic institutions. According to Murphy, a "truce between (for lack of better terms) the GMU Austro-libertarians and the Auburn Austro-libertarians" was signed around 2011.Many theories developed by "first wave" Austrian economists have long been absorbed into mainstream economics. These include Carl Menger's theories on marginal utility, Friedrich von Wieser's theories on opportunity cost, and Eugen Böhm von Bawerk's theories on time preference, as well as Menger and Böhm-Bawerk's criticisms of Marxian economics.Former U.S. Federal Reserve Chairman Alan Greenspan said that the founders of the Austrian School "reached far into the future from when most of them practiced and have had a profound and, in my judgment, probably an irreversible effect on how most mainstream economists think in this country." In 1987, Nobel Laureate James M. Buchanan told an interviewer, "I have no objections to being called an Austrian. Hayek and Mises might consider me an Austrian but, surely some of the others would not."Chinese economist Zhang Weiying, supports some Austrian theories such as the Austrian theory of the business cycle. Currently, universities with a significant Austrian presence are George Mason University, New York University, Loyola University New Orleans, and Auburn University in the United States, King Juan Carlos University in Spain and Universidad Francisco Marroquín in Guatemala. Austrian economic ideas are also promoted by privately funded organizations such as the Mises Institute, and the Cato Institute.Mainstream economists have argued that Austrians are often averse to the use of mathematics and statistics in economics. However, independent scholar Martin Sibileau, in 2014, suggested a logics-based approach for a definitive formalization of the Austrian thought.Economist Bryan Caplan argues that many Austrians have not understood valid contributions of modern mainstream economics, causing them to overstate their differences with it. For example, Murray Rothbard stated that he objected to the use of cardinal utility in microeconomic theory. Caplan says that Rothbard did not understand the position he was attacking, because microeconomic theorists go to great pains to show that their results are derived for any monotonic transformation of an ordinal utility function, and do not entail cardinal utility. The result is that conclusions about utility preferences hold no matter what values are assigned to them.Economist Paul Krugman has stated that because Austrians do not use "explicit models" they are unaware of holes in their own thinking.Economist Benjamin Klein has criticized the economic methodological work of Austrian economist Israel M. Kirzner. While praising Kirzner for highlighting shortcomings in traditional methodology, Klein argued that Kirzner did not provide a viable alternative for economic methodology. Economist Tyler Cowen has written that Kirzner's theory of entrepreneurship can ultimately be reduced to a neoclassical search model and is thus not in the radical subjectivist tradition of Austrian praxeology. Cowen states that Kirzner's entrepreneurs can be modeled in mainstream terms of search.Economist Jeffrey Sachs argues that among developed countries, those with high rates of taxation and high social welfare spending perform better on most measures of economic performance compared to countries with low rates of taxation and low social outlays. He concludes that Friedrich Hayek was wrong to argue that high levels of government spending harms an economy, and "a generous social-welfare state is not a road to serfdom but rather to fairness, economic equality and international competitiveness." Austrian economist Sudha Shenoy responded by arguing that countries with large public sectors have grown more slowly.Economist Bryan Caplan has noted that Mises has been criticized as allegedly overstating the strength of his case in describing socialism as impossible rather than as something that would need to establish non-market institutions to deal with the inefficiency.Critics generally argue that Austrian economics lacks scientific rigor and rejects scientific methods and the use of empirical data in modelling economic behavior. Some economists describe Austrian methodology as being a priori or non-empirical.Economist Mark Blaug has criticized over-reliance on methodological individualism, arguing it would rule out all macroeconomic propositions that cannot be reduced to microeconomic ones, and hence reject almost the whole of received macroeconomics.Economist Thomas Mayer has stated that Austrians advocate a rejection of the scientific method which involves the development of empirically falsifiable theories. Furthermore, many supporters of using models of market behavior to analyze and test economic theory argue that economists have developed numerous experiments that elicit useful information about individual preferences.Although economist Leland Yeager is sympathetic to Austrian economics, he rejects many favorite views of the Misesian group of Austrians, in particular, "the specifics of their business-cycle theory, ultra-subjectivism in value theory and particularly in interest-rate theory, their insistence on unidirectional causality rather than general interdependence, and their fondness for methodological brooding, pointless profundities, and verbal gymnastics."Economist Paul A. Samuelson wrote in 1964, most economists believe, that economic conclusions reached by pure logical deduction are limited and weak. According to Samuelson and economist Bryan Caplan, Mises' deductive methodology also embraced by Murray Rothbard and to a lesser extent by Mises' student, Israel Kirzner was not sufficient in and of itself. Bryan Caplan wrote that the Austrian challenge to the realism of neoclassical assumptions helped work towards making those assumptions more plausible.Most research regarding Austrian business cycle theory finds that it is inconsistent with empirical evidence. Economists such as Gordon Tullock, Bryan Caplan, Milton Friedman, and Paul Krugman have said that they regard the theory as incorrect. Austrian economist Ludwig Lachmann noted that the Austrian theory was rejected during the 1930s:The promise of an Austrian theory of the trade cycle, which might also serve to explain the severity of the Great Depression, a feature of the early 1930s that provided the background for Hayek’s successful appearance on the London scene, soon proved deceptive. Three giants – Keynes, Knight and Sraffa – turned against the hapless Austrians who, in the middle of that black decade, thus had to do battle on three fronts. Naturally it proved a task beyond their strength.Some economists argue that Austrian business cycle theory requires bankers and investors to exhibit a kind of irrationality, because the Austrian theory posits that investors will be fooled repeatedly (by temporarily low interest rates) into making unprofitable investment decisions. Bryan Caplan writes: "Why does Rothbard think businessmen are so incompetent at forecasting government policy? He credits them with entrepreneurial foresight about all market-generated conditions, but curiously finds them unable to forecast government policy, or even to avoid falling prey to simple accounting illusions generated by inflation and deflation… Particularly in interventionist economies, it would seem that natural selection would weed out businesspeople with such a gigantic blind spot."Economist Paul Krugman has argued that the theory cannot explain changes in unemployment over the business cycle. Austrian business cycle theory postulates that business cycles are caused by the misallocation of resources from consumption to investment during "booms", and out of investment during "busts". Krugman argues that because total spending is equal to total income in an economy, the theory implies that the reallocation of resources during "busts" would increase employment in consumption industries, whereas in reality, spending declines in all sectors of an economy during recessions. He also argues that according to the theory the initial "booms" would also cause resource reallocation, which implies an increase in unemployment during booms as well.In response, historian David Gordon argues that Krugman's analysis misrepresents Austrian theory. Gordon states, "unemployment, as Austrians see matters, stems mainly from rigid wage rates. If workers accept a fall in wages, liquidation of the boom is compatible with full employment." Austrian economist Roger Garrison states that a false boom caused by artificially low interest rates would cause a boom in consumption goods as well as investment goods (with a decrease in "middle goods"), thus explaining the jump in unemployment at the end of a boom. Garrison has also stated that capital allocated to investment goods cannot always be redeployed to create consumption goods.Economist Jeffery Hummel is critical of Hayek's explanation of labor asymmetry in booms and busts. He argues that Hayek makes peculiar assumptions about demand curves for labor in his explanation of how a decrease in investment spending creates unemployment. He also argues that the labor asymmetry can be explained in terms of a change in real wages, but this explanation fails to explain the business cycle in terms of resource allocation.Milton Friedman objected to the policy implications of the theory, stating the following in a 1998 interview:I think the Austrian business-cycle theory has done the world a great deal of harm. If you go back to the 1930s, which is a key point, here you had the Austrians sitting in London, Hayek and Lionel Robbins, and saying you just have to let the bottom drop out of the world. You’ve just got to let it cure itself. You can’t do anything about it. You will only make it worse. You have Rothbard saying it was a great mistake not to let the whole banking system collapse. I think by encouraging that kind of do-nothing policy both in Britain and in the United States, they did harm.Hummel argues that the Austrian explanation of the business cycle fails on empirical grounds. In particular, he notes that investment spending remained positive in all recessions where there are data, except for the Great Depression. He argues that this casts doubt on the notion that recessions are caused by a reallocation of resources from industrial production to consumption, since he argues that the Austrian business cycle theory implies that net investment should be below zero during recessions. In response, Austrian economist Walter Block argues that the misallocation during booms does not preclude the possibility of demand increasing overall.In 1969, economist Milton Friedman, after examining the history of business cycles in the U.S., concluded that "The Hayek-Mises explanation of the business cycle is contradicted by the evidence. It is, I believe, false." He analyzed the issue using newer data in 1993, and again reached the same conclusion. Referring to Friedman's discussion of the business cycle, Austrian economist Roger Garrison argued that Friedman's empirical findings are broadly consistent with both Monetarist and Austrian views", and goes on to argue that although Friedman's model "describes the economy's performance at the highest level of aggregation; Austrian theory offers an insightful account of the market process that might underlie those aggregates."