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Economic model

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cannot capture the full detail of the underlying system, so rely on approximate equations; (ii) they are sensitive to small changes in the exact form of these equations. This is because complex systems like the economy or the climate consist of a delicate balance of opposing forces, so a slight imbalance in their representation has big effects. Thus, predictions of things like economic recessions are still highly inaccurate, despite the use of enormous models running on fast computers. See
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model is only useful to the extent that it accurately mirrors the relationships that it purports to describe. Creating and diagnosing a model is frequently an iterative process in which the model is modified (and hopefully improved) with each iteration of diagnosis and respecification. Once a satisfactory model is found, it should be double checked by applying it to a different data set.
4238: 873: 27: 2388:, is the claim that many of the true forces shaping the economy can never be captured in a single plan. This is an argument that cannot be made through a conventional (mathematical) economic model because it says that there are critical systemic-elements that will always be omitted from any top-down analysis of the economy. 2165:
models will actually predict where the economy is going, or the effect of any shock upon it. The new, more humble, approach sees danger in dramatic policy changes based on model predictions, because of several practical and theoretical limitations in current macroeconomic models; in addition to the theoretical pitfalls, (
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Most economic models rest on a number of assumptions that are not entirely realistic. For example, agents are often assumed to have perfect information, and markets are often assumed to clear without friction. Or, the model may omit issues that are important to the question being considered, such as
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Thus the profit maximization model predicts something about the effect of taxation on output, namely that output decreases with increased taxation. If the predictions of the model fail, we conclude that the profit maximization hypothesis was false; this should lead to alternate theories of the firm,
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or non-stochastic models; according to whether all the variables are quantitative, economic models are classified as discrete or continuous choice model; according to the model's intended purpose/function, it can be classified as quantitative or qualitative; according to the model's ambit, it can be
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and explained that the weather, human health and economics use similar methods of prediction (mathematical models). Their systems—the atmosphere, the human body and the economy—also have similar levels of complexity. He found that forecasts fail because the models suffer from two problems: (i) they
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The details of model construction vary with type of model and its application, but a generic process can be identified. Generally, any modelling process has two steps: generating a model, then checking the model for accuracy (sometimes called diagnostics). The diagnostic step is important because a
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More recently, chaos (or the butterfly effect) has been identified as less significant than previously thought to explain prediction errors. Rather, the predictive power of economics and meteorology would mostly be limited by the models themselves and the nature of their underlying systems (see
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Partly as a result of such experiments, modern central bankers no longer have as much confidence that it is possible to 'fine-tune' the economy as they had in the 1960s and early 1970s. Modern policy makers tend to use a less activist approach, explicitly because they lack confidence that their
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research program to identify which variables are chaotic (if any) has largely concluded that aggregate macroeconomic variables probably do not behave chaotically. This would mean that refinements to the models could ultimately produce reliable long-term forecasts. However, the validity of this
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available at the time. They compared the models' predictions for how the economy would respond to specific economic shocks (allowing the models to control for all the variability in the real world; this was a test of model vs. model, not a test against the actual outcome). Although the models
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infeasibility and the incompleteness or lack of theories for various types of economic behavior. Therefore, conclusions drawn from models will be approximate representations of economic facts. However, properly constructed models can remove extraneous information and isolate useful
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between variables). In some cases economic predictions in a coincidence of a model merely assert the direction of movement of economic variables, and so the functional relationships are used only stoical in a qualitative sense: for example, if the
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classified as a general equilibrium model, a partial equilibrium model, or even a non-equilibrium model; according to the economic agent's characteristics, models can be classified as rational agent models, representative agent models etc.
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is a general economic concept, but to measure inflation requires a model of behavior, so that an economist can differentiate between changes in relative prices and changes in price that are to be attributed to inflation.
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fluctuations. Economists therefore must make a reasoned choice of which variables and which relationships between these variables are relevant and which ways of analyzing and presenting this information are useful.
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Defines model by analogy with maps, an idea borrowed from Baumol and Blinder. Discusses deduction within models, and logical derivation of one model from another. Chapter 9 compares the neoclassical school and the
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This is a classic book carefully discussing comparative statics in microeconomics, though some dynamics is studied as well as some macroeconomic theory. This should not be confused with Samuelson's popular
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The fact that all the model's relationships and coefficients are stochastic, so that the error term becomes very large quickly, and the available snapshot of the input parameters is already out of date.
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At a more practical level, quantitative modelling is applied to many areas of economics and several methodologies have evolved more or less independently of each other. As a result, no overall model
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that can be independently discussed and tested and that can be applied in various instances. Policies and arguments that rely on economic models have a clear basis for soundness, namely the
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A series of essays and papers analysing questions about how (and whether) models and theories in economics are empirically verified and the current status of positivism in economics.
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simplified the world and started from a stable, known common parameters the various models gave significantly different answers. For instance, in calculating the impact of a
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One of the major problems addressed by economic models has been understanding economic growth. An early attempt to provide a technique to approach this came from the French
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In general terms, economic models have two functions: first as a simplification of and abstraction from observed data, and second as a means of selection of data based on a
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on his early research in finance: "I quickly dropped ... chaos theory it was too easy to construct ‘toy models’ that looked plausible but were useless in practice."
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Limitations in model construction caused by difficulties in understanding the underlying mechanisms of the real economy. (Hence the profusion of separate models.)
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in which possible future events are played out. Another example is non-numerical decision tree analysis. Qualitative models often suffer from lack of precision.
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is the vector of individual prices of goods and services. Models in which the vector nature of the quantities is maintained are used in practice, for example
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of economic processes. This complexity can be attributed to the diversity of factors that determine economic activity; these factors include: individual and
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of key relationships. In this way more can be understood about the relationships in question than by trying to understand the entire economic process.
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models have incorporated economic relationships between simulated variables in an attempt to detect high-exposure future scenarios (often through a
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is important because the nature of an economic model will often determine what facts will be looked at and how they will be compiled. For example,
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The author makes several unexpected suggestions: Look for a model in the real world, not in journals. Look at the literature later, not sooner.
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is naturally available. We can nonetheless provide a few examples that illustrate some particularly relevant points of model construction.
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has vigorously argued that these lags are so long and unpredictably variable that effective management of the macroeconomy is impossible.
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All through the 18th century (that is, well before the founding of modern political economy, conventionally marked by Adam Smith's 1776
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are of this kind. However, for the most part, these models are computationally much harder to deal with and harder to use as tools for
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about these processes or estimate parameters for them. A widely used bargaining class of simple econometric models popularized by
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strategy at the level of the firm, or to provide intelligent advice for household economic decisions at the level of households.
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challenged this view and those who hold it, saying that chaos in economics is suffering from a biased "crusade" against it by
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A thorough discussion of many quantitative models used in modern economic theory. Also a careful discussion of aggregation.
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in both receiving data and the reaction of economic variables to policy makers attempts to 'steer' them (mostly through
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Optimality and constrained optimization models – Other examples of quantitative models are based on principles such as
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models, in which the stochastic process satisfies some relation between current and past values. Examples of these are
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Presenting reasoned arguments to politically justify economic policy at the national level, to explain and influence
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Modern economic models incorporate the reaction of the public and market to the policy maker's actions (through
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for that item will decrease. For such models, economists often use two-dimensional graphs instead of functions.
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According to whether all the model variables are deterministic, economic models can be classified as
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Economic and meteorological simulations may share a fundamental limit to their predictive powers:
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This article is about theoretical modelling. For the overall economic structure of a society, see
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One of the earliest studies on methodology of economics, analysing the postulate of rationality.
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economic activity in a way in which conclusions are logically related to assumptions;
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is the price that a product commands in the market if it is supplied at the rate
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Appraising Economic Theories: Studies in the Methodology of Research Programs
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after one year, and one gave almost no change, with the rest spread between.
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is a functional relationship between consumption and national income: C = C(
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began in the 1970s the danger of chaos had been identified and defined in
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Unreasonable ineffectiveness of mathematics § Economics and finance
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usually lump together different variables into a single quantity such as
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were often traded based on economic models predicting the growth of the
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was known particularly for his development and use of tables he called
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Apollo's Arrow: The Science of Prediction and the Future of Everything
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The difficulty in correctly specifying all of the parameters (through
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came along he had a well-established mathematical basis to draw from.
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Income, Employment and Public Policy; essays in honor of Alvin Hansen
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models). If the response to the decision maker's actions (and their
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Economics Glossary; Terms Beginning with S. Accessed June 19, 2008.
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under which this holds. The first order maximization condition for
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measurements) even if the structural model and data were perfect.
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policy) in the direction that central bankers want them to move.
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Beyond Positivism: Economic Methodology in the Twentieth Century
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It is straightforward to design economic models susceptible to
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is the tax that the firm must pay per unit of the product sold.
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on the profit-maximizing firm. The profit of a firm is given by
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Nonlinearity and Chaos in Macroeconomics and Financial Markets
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assumption states that a firm will produce at the output rate
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and/or quantitative relationships between them. The economic
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is particularly important for economics given the enormous
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the relationship between interest rates and assets markets
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school in the eighteenth century. Among these economists,
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loosening on output some models estimated a 3% change in
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Borrowing a notion apparently first used in economics by
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studies problems related to savings and interest in the
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addressed some of these problems in the 3rd edition of
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guides an economy to prosperity more efficiently than
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a macroeconomic model of aggregate demand– and supply
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may be purely qualitative (for example, relating to
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Economic models in current use do not pretend to be
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ACM Transactions on Information and System Security
2384:using an economic model. One reason, emphasized by 3053:"The Economics of Information Security Investment" 2889: 2860: 2831: 2636:Frequently Asked Questions in Quantitative Finance 2554: 1902: 1727: 1576: 1556: 1532: 1511:is the revenue obtained from selling the product, 1503: 1471: 1451: 1416: 3026:A Study in the Analysis of Stationary Time Series 2798:(1), The Review of Economic Studies Ltd.: 19–32, 2553:(1953). "The Methodology of Positive Economics". 2261:Effects of deterministic chaos on economic models 1277:model is one based on the premise that for every 2335:may well be subject to chaos. Also in 2004, the 1960:needs to deal with aggregate quantities such as 1597:if that rate maximizes the firm's profit. Using 1315:failure to confirm them, would be attributed to 2328:in order to preserve their mathematical models. 2124:. All of these developments were summarized by 2992:Statistical Testing of Business Cycle Theories 2782:, in particular in relation to falsifiability. 3144: 2790:(1945), "The Scope and Method of Economics", 2612:"FAQ for Apollo's Arrow Future of Everything" 1417:{\displaystyle \pi (x,t)=xp(x)-C(x)-tx\quad } 1332:. An example of such a model is given by the 1214:autoregressive conditional heteroskedasticity 1114:issuing them. Since the 1990s many long-term 909: 16:Simplified representation of economic reality 8: 3003:The New Palgrave: A Dictionary of Economics 3000:Walsh, Vivian (1987), "Models and theory", 2538:The New Palgrave: A Dictionary of Economics 2343:concludes that after noise is removed from 2269:. Although the modern mathematical work on 3151: 3137: 3129: 1307:accounting. Accounting models are true by 1292:algebraic sum of inflows = sinks − sources 916: 902: 36: 2830:de Marchi, N. B. & Blaug, M. (1991), 2745:(Revised ed.), New York: Routledge, 2595: 2316:conclusion has generated two challenges: 1972:and so on. Now real output is actually a 1888: 1855: 1848: 1833: 1785: 1778: 1776: 1660: 1622: 1620: 1569: 1549: 1516: 1484: 1464: 1435: 1351: 3036:Demand Analysis: A Study in Econometrics 2867:, New York: Cambridge University Press, 2561:. Chicago: University of Chicago Press. 2527:The New Palgrave Dictionary of Economics 2362:Comparison with models in other sciences 2237:Comparison with models in other sciences 2116:studied "moral probability" in his book 2094:contributed to this field. Around 1730, 4233: 3104:How to build a model in your spare time 2489: 2376:economic thinking is that the market's 1540:is the cost of bringing the product to 48: 2019:. For instance, one ingredient of the 3112:Classical & Keynesian AD-AS Model 2863:The Economic Theory of Modern Society 2090:. Many of the giants of 18th century 1984:, such as cars, passenger airplanes, 1745:as an implicitly defined function of 1299:This principle is certainly true for 1075:economies, and on a smaller scale in 7: 2639:, John Wiley and Sons, p. 227, 1210:autoregressive moving average models 3096:Stanford Encyclopedia of Philosophy 2469:Agent-based computational economics 1054:to modify future economic activity; 3034:Wold, H. & Jureen, L. (1953), 3028:, Stockholm: Almqvist and Wicksell 2896:, Toronto: Harper Collins Canada, 2308:of initial-condition sensitivity. 2140:Tests of macroeconomic predictions 2130:Analytical Theory of Probabilities 1881: 1852: 1830: 1782: 1704: 1663: 1648: 1625: 1040:interest, uses of models include: 1036:In addition to their professional 14: 2086:itself and in the development of 4236: 3674:neoclassical–Keynesian synthesis 2965:Foundations of Economic Analysis 2838:, Brookfield, VT: Edward Elgar, 2724:Economics: Principles and Policy 2582:Frankel, Jeffrey A. (May 1986). 2248:wrote on this issue in his book 1945:operationally meaningful theorem 1106:). For example, emerging market 939:construct representing economic 883: 871: 56: 2762:Economic Models and Methodology 1413: 1247:of an item increases, then the 1145:theories of everything economic 158:Concepts, theory and techniques 2917:Quarterly Journal of Economics 2448:for cyber security investments 2368:Critique of hubris in planning 2341:Economics on the Edge of Chaos 2297:Economics on the Edge of Chaos 1876: 1864: 1824: 1821: 1815: 1806: 1800: 1791: 1699: 1696: 1690: 1681: 1675: 1666: 1643: 1631: 1527: 1521: 1498: 1492: 1446: 1440: 1401: 1395: 1386: 1380: 1368: 1356: 1: 3610:Critique of political economy 2764:, New York: Greenwood Press, 2244:specialist and mathematician 2043:problems with economic models 2032:Problems with economic models 2924:(1), The MIT Press: 137–44, 2557:Essays in Positive Economics 1601:we can obtain conditions on 1220:models for the modelling of 2994:, Geneva: League of Nations 2962:Samuelson, Paul A. (1983), 2588:NBER Working Paper No. 1925 2392:Examples of economic models 1238:, and/or specific forms of 1071:, in the case of centrally 963:. A model may have various 4280: 3748:Real business-cycle theory 3090:R. Frigg and S. Hartmann, 2792:Review of Economic Studies 2440:Ramsey–Cass–Koopmans model 2132:(1812). Thus, by the time 1753:), one concludes that the 18: 4188: 2670:University of Connecticut 1951:under certain conditions. 1916:which is negative if the 1751:implicit function theorem 1212:and related ones such as 1140:of the supporting model. 2956:, New York: W. W. Norton 2741:Caldwell, Bruce (1994), 2687:American Economic Review 2337:University of Canterbury 2122:Saint Petersburg problem 1303:and it is the basis for 1240:functional relationships 1017:requirements and purely 146:JEL classification codes 3388:Industrial organization 3218:Computational economics 3117:IFs Economic Sub-Model 2616:www.postpythagorean.com 2464:Computational economics 2326:neo-classical economics 2178:unintended consequences 2144:In the late 1980s, the 2104:. Even earlier (1709), 2101:The Doctrine of Chances 1918:second order conditions 1132:for applying logic and 1129:argumentative framework 1126:A model establishes an 955:is a simplified, often 332:Industrial organization 189:Computational economics 4243:Business and economics 3593:Modern monetary theory 3258:Experimental economics 3228:Pluralism in economics 3213:Mathematical economics 2659:Kuchta, Steve (2004), 2633:Wilmott, Paul (2009), 2496:Moffatt, Mike. (2008) 2418:of international trade 1904: 1749:by this equation (see 1729: 1578: 1558: 1534: 1505: 1473: 1453: 1418: 1236:hyperbolic coordinates 1192:to formulate and test 184:Experimental economics 34: 3120:: Online Global Model 3069:10.1145/581271.581274 2760:Holcombe, R. (1989), 2502:Structural Parameters 2416:Heckscher–Ohlin model 2347:returns, evidence of 2214:rational expectations 2146:Brookings Institution 1930:for example based on 1905: 1730: 1599:differential calculus 1579: 1559: 1535: 1506: 1504:{\displaystyle xp(x)} 1474: 1454: 1419: 1228:Non-stochastic models 1180:are formulated using 961:structural parameters 29: 4264:Conceptual modelling 3467:Social choice theory 3223:Behavioral economics 2459:Economic methodology 2150:macroeconomic models 2148:compared 12 leading 2064:Tableaux Ă©conomiques 2005:macroeconomic models 2001:qualitative analysis 1775: 1765:has the same sign as 1619: 1568: 1548: 1533:{\displaystyle C(x)} 1515: 1483: 1463: 1452:{\displaystyle p(x)} 1434: 1350: 1330:utility maximization 1232:social choice theory 1182:stochastic processes 997:decision processes, 411:Social choice theory 3551:American (National) 3251:Economic statistics 3045:Gordon, Lawrence A. 2540:, v. 3, pp. 482–83. 2422:Black–Scholes model 2410:Lucas islands model 2290:, Econometrica, 26 2003:. For this reason, 1997:input–output models 1932:bounded rationality 1591:profit maximization 1334:comparative statics 965:exogenous variables 878:Business portal 199:Operations research 179:National accounting 3124:Economic attractor 2946:Samuelson, Paul A. 2507:2016-01-07 at the 2442:of economic growth 2406:of economic growth 2398:Cobb–Douglas model 2279:as early as 1958: 2084:probability theory 1956:Aggregate models. 1900: 1725: 1574: 1554: 1530: 1501: 1469: 1449: 1414: 1255:Qualitative models 1222:heteroskedasticity 1120:Monte Carlo method 209:Industrial complex 204:Middle income trap 35: 4224: 4223: 3755:New institutional 3092:Models in Science 3051:(November 2002). 3038:, New York: Wiley 2983: 2950:Metzler, Lloyd A. 2912:Phillips, Almarin 2903:978-0-00-200740-5 2881: 2857:Morishima, Michio 2852: 2826: 2783: 2524:, 2008 "models," 2446:Gordon–Loeb model 2424:of option pricing 2331:The variables in 2306:butterfly effects 2218:Robert Lucas, Jr. 2106:Nicolas Bernoulli 2088:actuarial science 2072:Wealth of Nations 1895: 1843: 1711: 1655: 1577:{\displaystyle t} 1557:{\displaystyle x} 1472:{\displaystyle x} 1259:scenario planning 1178:Stochastic models 1112:developing nation 926: 925: 30:A diagram of the 4271: 4259:Economics models 4241: 4240: 4232: 3428:Natural resource 3263:Economic history 3201:Mechanism design 3153: 3146: 3139: 3130: 3110:Elmer G. Wiens: 3080: 3039: 3029: 3016: 2995: 2980: 2978: 2957: 2940: 2906: 2895: 2879: 2877: 2866: 2850: 2848: 2837: 2824: 2822: 2776: 2774: 2755: 2736: 2703: 2702: 2683:Hayek, Friedrich 2679: 2673: 2672: 2667: 2656: 2650: 2649: 2626: 2620: 2619: 2608: 2602: 2601: 2599: 2579: 2573: 2572: 2560: 2547: 2541: 2519: 2513: 2494: 2404:Solow–Swan model 2382:central planning 2372:A key strand of 2114:Daniel Bernoulli 2059:François Quesnay 1909: 1907: 1906: 1901: 1896: 1894: 1893: 1892: 1879: 1860: 1859: 1849: 1844: 1842: 1838: 1837: 1827: 1790: 1789: 1779: 1761:with respect to 1734: 1732: 1731: 1726: 1712: 1710: 1702: 1661: 1656: 1654: 1646: 1623: 1583: 1581: 1580: 1575: 1563: 1561: 1560: 1555: 1539: 1537: 1536: 1531: 1510: 1508: 1507: 1502: 1478: 1476: 1475: 1470: 1458: 1456: 1455: 1450: 1423: 1421: 1420: 1415: 918: 911: 904: 890:Money portal 888: 887: 886: 876: 875: 372:Natural resource 164:Economic systems 60: 37: 4279: 4278: 4274: 4273: 4272: 4270: 4269: 4268: 4249: 4248: 4247: 4235: 4227: 4225: 4220: 4217:Business portal 4184: 4183: 4182: 4142: 3906:von Böhm-Bawerk 3794: 3793: 3784: 3556:Ancient thought 3534: 3533: 3527: 3518: 3517: 3516: 3267: 3232: 3196:Contract theory 3181:Decision theory 3162: 3157: 3094:. Entry in the 3087: 3049:Loeb, Martin P. 3043: 3033: 3020: 3014: 2999: 2986: 2976: 2961: 2944: 2930:10.2307/1884854 2910: 2904: 2884: 2875: 2855: 2846: 2829: 2804:10.2307/2296113 2786: 2780:Austrian School 2772: 2759: 2753: 2740: 2734: 2716:Baumol, William 2714: 2711: 2706: 2681: 2680: 2676: 2665: 2658: 2657: 2653: 2647: 2632: 2627: 2623: 2610: 2609: 2605: 2581: 2580: 2576: 2569: 2549: 2548: 2544: 2535: 2530:, 2nd Edition, 2520: 2516: 2509:Wayback Machine 2495: 2491: 2487: 2479:Financial model 2455: 2412:of money supply 2394: 2386:Friedrich Hayek 2370: 2322:Philip Mirowski 2271:chaotic systems 2263: 2242:Complex systems 2239: 2216:revolution and 2193:Milton Friedman 2142: 2110:Ars Conjectandi 2051: 2034: 2021:Keynesian model 1884: 1880: 1851: 1850: 1829: 1828: 1781: 1780: 1773: 1772: 1703: 1662: 1647: 1624: 1617: 1616: 1566: 1565: 1546: 1545: 1513: 1512: 1481: 1480: 1461: 1460: 1432: 1431: 1348: 1347: 1305:national income 1166: 1164:Types of models 1116:risk management 1052:economic policy 973: 922: 884: 882: 870: 863: 862: 833: 823: 822: 821: 820: 584:von Böhm-Bawerk 472: 461: 460: 222: 214: 213: 169:Economic growth 159: 151: 150: 92: 90:classifications 24: 21:Economic system 17: 12: 11: 5: 4277: 4275: 4267: 4266: 4261: 4251: 4250: 4246: 4245: 4222: 4221: 4219: 4214: 4209: 4204: 4199: 4194: 4189: 4186: 4185: 4181: 4180: 4175: 4165: 4160: 4154: 4153: 4152: 4150: 4144: 4143: 4141: 4140: 4133: 4128: 4123: 4118: 4113: 4108: 4103: 4098: 4093: 4088: 4083: 4078: 4073: 4068: 4063: 4058: 4053: 4048: 4043: 4038: 4033: 4028: 4023: 4018: 4013: 4008: 4003: 3998: 3993: 3988: 3983: 3978: 3973: 3968: 3963: 3958: 3953: 3948: 3943: 3938: 3933: 3928: 3923: 3918: 3913: 3908: 3903: 3898: 3893: 3888: 3883: 3878: 3873: 3868: 3863: 3858: 3853: 3848: 3843: 3838: 3833: 3828: 3823: 3818: 3813: 3808: 3803: 3797: 3795: 3789: 3786: 3785: 3783: 3782: 3777: 3772: 3767: 3762: 3757: 3752: 3751: 3750: 3740: 3739: 3738: 3728: 3723: 3718: 3717: 3716: 3706: 3701: 3696: 3695: 3694: 3693: 3692: 3682: 3677: 3662: 3657: 3652: 3647: 3642: 3637: 3632: 3627: 3622: 3620:Disequilibrium 3617: 3612: 3607: 3602: 3597: 3596: 3595: 3585: 3580: 3575: 3570: 3569: 3568: 3558: 3553: 3548: 3543: 3537: 3535: 3523: 3520: 3519: 3515: 3514: 3509: 3504: 3499: 3494: 3489: 3484: 3479: 3474: 3469: 3460: 3455: 3450: 3445: 3440: 3435: 3433:Organizational 3430: 3425: 3420: 3415: 3410: 3405: 3400: 3395: 3390: 3385: 3380: 3375: 3370: 3365: 3360: 3355: 3350: 3345: 3340: 3335: 3330: 3325: 3320: 3315: 3310: 3305: 3300: 3295: 3290: 3285: 3279: 3278: 3277: 3275: 3269: 3268: 3266: 3265: 3260: 3255: 3254: 3253: 3242: 3240: 3234: 3233: 3231: 3230: 3225: 3220: 3215: 3210: 3208:Macroeconomics 3205: 3204: 3203: 3198: 3193: 3188: 3183: 3176:Microeconomics 3172: 3170: 3164: 3163: 3158: 3156: 3155: 3148: 3141: 3133: 3127: 3126: 3121: 3115: 3108: 3099: 3086: 3085:External links 3083: 3082: 3081: 3063:(4): 438–457. 3041: 3031: 3018: 3012: 2997: 2988:Tinbergen, Jan 2984: 2974: 2959: 2942: 2908: 2902: 2882: 2873: 2853: 2844: 2827: 2784: 2770: 2757: 2751: 2738: 2732: 2710: 2707: 2705: 2704: 2674: 2651: 2645: 2621: 2603: 2574: 2567: 2542: 2522:Mary S. Morgan 2514: 2488: 2486: 2483: 2482: 2481: 2476: 2471: 2466: 2461: 2454: 2451: 2450: 2449: 2443: 2437: 2431: 2425: 2419: 2413: 2407: 2401: 2393: 2390: 2378:invisible hand 2369: 2366: 2357: 2356: 2329: 2302: 2301: 2288:William Baumol 2284: 2262: 2259: 2250:Apollo's Arrow 2238: 2235: 2234: 2233: 2222:Lucas critique 2206: 2203: 2196: 2181: 2174: 2141: 2138: 2118:Mensura Sortis 2050: 2047: 2033: 2030: 2029: 2028: 1958:Macroeconomics 1953: 1952: 1941:Paul Samuelson 1936: 1935: 1926: 1925: 1924:are satisfied. 1913: 1912: 1911: 1910: 1899: 1891: 1887: 1883: 1878: 1875: 1872: 1869: 1866: 1863: 1858: 1854: 1847: 1841: 1836: 1832: 1826: 1823: 1820: 1817: 1814: 1811: 1808: 1805: 1802: 1799: 1796: 1793: 1788: 1784: 1767: 1766: 1738: 1737: 1736: 1735: 1724: 1721: 1718: 1715: 1709: 1706: 1701: 1698: 1695: 1692: 1689: 1686: 1683: 1680: 1677: 1674: 1671: 1668: 1665: 1659: 1653: 1650: 1645: 1642: 1639: 1636: 1633: 1630: 1627: 1611: 1610: 1586: 1585: 1573: 1553: 1529: 1526: 1523: 1520: 1500: 1497: 1494: 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377:Organizational 374: 369: 364: 359: 354: 349: 344: 339: 334: 329: 324: 319: 314: 309: 304: 299: 294: 289: 284: 279: 274: 269: 264: 259: 254: 249: 244: 239: 234: 229: 223: 221:By application 220: 219: 216: 215: 212: 211: 206: 201: 196: 191: 186: 181: 176: 171: 166: 160: 157: 156: 153: 152: 149: 148: 143: 138: 133: 128: 123: 114: 109: 104: 99: 93: 87: 86: 83: 82: 81: 80: 75: 70: 62: 61: 53: 52: 46: 45: 15: 13: 10: 9: 6: 4: 3: 2: 4276: 4265: 4262: 4260: 4257: 4256: 4254: 4244: 4239: 4234: 4230: 4218: 4215: 4213: 4210: 4208: 4205: 4203: 4200: 4198: 4195: 4193: 4190: 4187: 4179: 4176: 4173: 4169: 4166: 4164: 4161: 4159: 4156: 4155: 4151: 4149: 4145: 4139: 4138: 4134: 4132: 4129: 4127: 4124: 4122: 4119: 4117: 4114: 4112: 4109: 4107: 4104: 4102: 4099: 4097: 4094: 4092: 4089: 4087: 4084: 4082: 4079: 4077: 4074: 4072: 4069: 4067: 4064: 4062: 4059: 4057: 4054: 4052: 4049: 4047: 4044: 4042: 4039: 4037: 4034: 4032: 4029: 4027: 4024: 4022: 4019: 4017: 4014: 4012: 4009: 4007: 4004: 4002: 3999: 3997: 3994: 3992: 3989: 3987: 3984: 3982: 3979: 3977: 3974: 3972: 3969: 3967: 3964: 3962: 3959: 3957: 3954: 3952: 3949: 3947: 3944: 3942: 3939: 3937: 3934: 3932: 3929: 3927: 3924: 3922: 3919: 3917: 3914: 3912: 3909: 3907: 3904: 3902: 3899: 3897: 3894: 3892: 3889: 3887: 3884: 3882: 3879: 3877: 3874: 3872: 3869: 3867: 3864: 3862: 3859: 3857: 3854: 3852: 3849: 3847: 3844: 3842: 3839: 3837: 3834: 3832: 3829: 3827: 3824: 3822: 3819: 3817: 3814: 3812: 3809: 3807: 3804: 3802: 3801:de Mandeville 3799: 3798: 3796: 3792: 3787: 3781: 3778: 3776: 3773: 3771: 3768: 3766: 3763: 3761: 3758: 3756: 3753: 3749: 3746: 3745: 3744: 3743:New classical 3741: 3737: 3734: 3733: 3732: 3729: 3727: 3724: 3722: 3719: 3715: 3712: 3711: 3710: 3707: 3705: 3702: 3700: 3699:Malthusianism 3697: 3691: 3688: 3687: 3686: 3683: 3681: 3678: 3675: 3671: 3668: 3667: 3666: 3663: 3661: 3660:Institutional 3658: 3656: 3653: 3651: 3648: 3646: 3643: 3641: 3638: 3636: 3633: 3631: 3628: 3626: 3623: 3621: 3618: 3616: 3613: 3611: 3608: 3606: 3603: 3601: 3598: 3594: 3591: 3590: 3589: 3586: 3584: 3581: 3579: 3576: 3574: 3571: 3567: 3564: 3563: 3562: 3559: 3557: 3554: 3552: 3549: 3547: 3544: 3542: 3539: 3538: 3536: 3531: 3526: 3521: 3513: 3510: 3508: 3505: 3503: 3500: 3498: 3495: 3493: 3490: 3488: 3485: 3483: 3480: 3478: 3475: 3473: 3470: 3468: 3464: 3463:Public choice 3461: 3459: 3456: 3454: 3451: 3449: 3446: 3444: 3441: 3439: 3438:Participation 3436: 3434: 3431: 3429: 3426: 3424: 3421: 3419: 3416: 3414: 3411: 3409: 3406: 3404: 3401: 3399: 3398:Institutional 3396: 3394: 3391: 3389: 3386: 3384: 3381: 3379: 3376: 3374: 3371: 3369: 3366: 3364: 3361: 3359: 3356: 3354: 3351: 3349: 3348:Expeditionary 3346: 3344: 3341: 3339: 3338:Environmental 3336: 3334: 3331: 3329: 3326: 3324: 3321: 3319: 3316: 3314: 3311: 3309: 3306: 3304: 3301: 3299: 3296: 3294: 3291: 3289: 3286: 3284: 3281: 3280: 3276: 3274: 3270: 3264: 3261: 3259: 3256: 3252: 3249: 3248: 3247: 3244: 3243: 3241: 3239: 3235: 3229: 3226: 3224: 3221: 3219: 3216: 3214: 3211: 3209: 3206: 3202: 3199: 3197: 3194: 3192: 3189: 3187: 3184: 3182: 3179: 3178: 3177: 3174: 3173: 3171: 3169: 3165: 3161: 3154: 3149: 3147: 3142: 3140: 3135: 3134: 3131: 3125: 3122: 3119: 3116: 3113: 3109: 3106: 3105: 3100: 3097: 3093: 3089: 3088: 3084: 3078: 3074: 3070: 3066: 3062: 3058: 3054: 3050: 3046: 3042: 3037: 3032: 3027: 3023: 3019: 3015: 3013:0-935859-10-1 3009: 3005: 3004: 2998: 2993: 2989: 2985: 2977: 2975:0-674-31301-1 2971: 2967: 2966: 2960: 2955: 2951: 2947: 2943: 2939: 2935: 2931: 2927: 2923: 2919: 2918: 2913: 2909: 2905: 2899: 2894: 2893: 2887: 2886:Orrell, David 2883: 2876: 2874:0-521-21088-7 2870: 2865: 2864: 2858: 2854: 2847: 2845:1-85278-515-2 2841: 2836: 2835: 2828: 2821: 2817: 2813: 2809: 2805: 2801: 2797: 2793: 2789: 2785: 2781: 2773: 2771:0-313-26679-4 2767: 2763: 2758: 2754: 2752:0-415-10911-6 2748: 2744: 2739: 2735: 2733:0-15-518839-9 2729: 2725: 2721: 2720:Blinder, Alan 2717: 2713: 2712: 2708: 2700: 2696: 2693:(4): 519–30, 2692: 2688: 2684: 2678: 2675: 2671: 2664: 2663: 2655: 2652: 2648: 2646:9780470685143 2642: 2638: 2637: 2630: 2625: 2622: 2617: 2613: 2607: 2604: 2598: 2597:10.3386/w1925 2593: 2589: 2585: 2578: 2575: 2570: 2568:9780226264035 2564: 2559: 2558: 2552: 2546: 2543: 2539: 2533: 2529: 2528: 2523: 2518: 2515: 2511: 2510: 2506: 2503: 2499: 2493: 2490: 2484: 2480: 2477: 2475: 2472: 2470: 2467: 2465: 2462: 2460: 2457: 2456: 2452: 2447: 2444: 2441: 2438: 2435: 2432: 2429: 2426: 2423: 2420: 2417: 2414: 2411: 2408: 2405: 2402: 2400:of production 2399: 2396: 2395: 2391: 2389: 2387: 2383: 2379: 2375: 2367: 2365: 2363: 2354: 2350: 2349:deterministic 2346: 2342: 2338: 2334: 2330: 2327: 2323: 2319: 2318: 2317: 2314: 2311:However, the 2309: 2307: 2299: 2298: 2293: 2289: 2285: 2282: 2281: 2280: 2278: 2277: 2272: 2268: 2260: 2258: 2256: 2251: 2247: 2243: 2236: 2231: 2227: 2223: 2219: 2215: 2211: 2207: 2204: 2201: 2197: 2194: 2190: 2186: 2182: 2179: 2175: 2172: 2171: 2170: 2168: 2162: 2160: 2156: 2151: 2147: 2139: 2137: 2135: 2134:David Ricardo 2131: 2127: 2123: 2119: 2115: 2111: 2107: 2103: 2102: 2097: 2093: 2089: 2085: 2081: 2077: 2073: 2068: 2066: 2065: 2060: 2056: 2048: 2046: 2044: 2040: 2039:externalities 2031: 2026: 2022: 2018: 2014: 2010: 2006: 2002: 1998: 1995: 1991: 1987: 1983: 1979: 1975: 1971: 1970:interest rate 1967: 1963: 1959: 1955: 1954: 1950: 1946: 1942: 1938: 1937: 1933: 1928: 1927: 1923: 1922:local maximum 1919: 1915: 1914: 1897: 1889: 1885: 1873: 1870: 1867: 1861: 1856: 1845: 1839: 1834: 1818: 1812: 1809: 1803: 1797: 1794: 1786: 1771: 1770: 1769: 1768: 1764: 1760: 1756: 1752: 1748: 1744: 1740: 1739: 1722: 1719: 1716: 1713: 1707: 1693: 1687: 1684: 1678: 1672: 1669: 1657: 1651: 1640: 1637: 1634: 1628: 1615: 1614: 1613: 1612: 1608: 1604: 1600: 1596: 1592: 1588: 1587: 1571: 1551: 1543: 1524: 1518: 1495: 1489: 1486: 1466: 1443: 1437: 1429: 1428: 1410: 1407: 1404: 1398: 1392: 1389: 1383: 1377: 1374: 1371: 1365: 1362: 1359: 1353: 1346: 1345: 1344: 1343: 1339: 1335: 1331: 1327: 1323: 1322: 1318: 1314: 1310: 1306: 1302: 1298: 1297: 1291: 1290: 1289: 1288: 1284: 1280: 1276: 1272: 1271: 1270: 1268: 1260: 1256: 1253: 1250: 1246: 1241: 1237: 1233: 1229: 1226: 1223: 1219: 1215: 1211: 1207: 1203: 1199: 1195: 1191: 1187: 1183: 1179: 1176: 1175: 1174: 1171: 1163: 1161: 1157: 1155: 1150: 1149:computational 1146: 1141: 1139: 1135: 1131: 1130: 1121: 1117: 1113: 1109: 1105: 1101: 1097: 1093: 1089: 1086: 1082: 1078: 1074: 1070: 1066: 1063: 1060: 1056: 1053: 1049: 1046: 1043: 1042: 1041: 1039: 1034: 1031: 1027: 1023: 1020: 1016: 1012: 1011:institutional 1009:constraints, 1008: 1004: 1003:environmental 1001:limitations, 1000: 996: 992: 988: 984: 982: 978: 970: 968: 966: 962: 958: 954: 950: 947:and a set of 946: 942: 938: 934: 932: 919: 914: 912: 907: 905: 900: 899: 897: 896: 891: 881: 879: 874: 869: 868: 867: 866: 859: 856: 853: 849: 846: 844: 841: 839: 836: 835: 832: 827: 826: 817: 816: 812: 810: 807: 805: 802: 800: 797: 795: 792: 790: 787: 785: 782: 780: 777: 775: 772: 770: 767: 765: 762: 760: 757: 755: 752: 750: 747: 745: 742: 740: 737: 735: 732: 730: 727: 725: 722: 720: 717: 715: 712: 710: 707: 705: 702: 700: 697: 695: 692: 690: 687: 685: 682: 680: 677: 675: 672: 670: 667: 665: 662: 660: 657: 655: 652: 650: 647: 645: 642: 640: 637: 635: 632: 630: 627: 625: 622: 620: 617: 615: 612: 610: 607: 605: 602: 600: 597: 595: 592: 590: 587: 585: 582: 580: 577: 575: 572: 570: 567: 565: 562: 560: 557: 555: 552: 550: 547: 545: 542: 540: 537: 535: 532: 530: 527: 525: 522: 520: 517: 515: 512: 510: 507: 505: 502: 500: 497: 495: 492: 490: 487: 485: 482: 480: 479:de Mandeville 477: 476: 471: 465: 464: 457: 454: 452: 449: 447: 444: 442: 439: 437: 434: 432: 429: 427: 424: 422: 419: 417: 414: 412: 408: 407:Public choice 405: 403: 400: 398: 395: 393: 390: 388: 385: 383: 382:Participation 380: 378: 375: 373: 370: 368: 365: 363: 360: 358: 355: 353: 350: 348: 345: 343: 342:Institutional 340: 338: 335: 333: 330: 328: 325: 323: 320: 318: 315: 313: 310: 308: 305: 303: 300: 298: 295: 293: 292:Expeditionary 290: 288: 285: 283: 282:Environmental 280: 278: 275: 273: 270: 268: 265: 263: 260: 258: 255: 253: 250: 248: 245: 243: 240: 238: 235: 233: 230: 228: 225: 224: 218: 217: 210: 207: 205: 202: 200: 197: 195: 192: 190: 187: 185: 182: 180: 177: 175: 172: 170: 167: 165: 162: 161: 155: 154: 147: 144: 142: 139: 137: 134: 132: 129: 127: 124: 122: 118: 115: 113: 112:International 110: 108: 105: 103: 100: 98: 95: 94: 91: 88:Branches and 85: 84: 79: 76: 74: 71: 69: 66: 65: 64: 63: 59: 55: 54: 51: 47: 43: 39: 38: 33: 28: 22: 4212:Publications 4168:Publications 4135: 3731:Neoclassical 3721:Mercantilism 3630:Evolutionary 3492:Sociological 3465: / 3363:Geographical 3343:Evolutionary 3318:Digitization 3283:Agricultural 3246:Econometrics 3186:Price theory 3103: 3095: 3060: 3056: 3035: 3025: 3001: 2991: 2963: 2953: 2921: 2915: 2891: 2862: 2833: 2795: 2791: 2788:Lange, Oskar 2761: 2742: 2723: 2690: 2686: 2677: 2661: 2654: 2635: 2629:Paul Wilmott 2624: 2615: 2606: 2587: 2577: 2556: 2551:Friedman, M. 2545: 2537: 2525: 2517: 2500: 2492: 2371: 2358: 2352: 2340: 2310: 2303: 2296: 2291: 2276:Econometrica 2274: 2264: 2246:David Orrell 2240: 2226:microfounded 2167:listed above 2163: 2143: 2099: 2069: 2062: 2055:physiocratic 2052: 2035: 2024: 2017:econometrics 2012: 2008: 1944: 1762: 1758: 1746: 1742: 1606: 1602: 1594: 1544:at the rate 1313:experimental 1264: 1254: 1227: 1188:is based on 1186:econometrics 1177: 1167: 1158: 1144: 1142: 1127: 1125: 1035: 1025: 1024: 1007:geographical 986: 985: 974: 957:mathematical 943:by a set of 929: 927: 848:Publications 813: 436:Sociological 409: / 307:Geographical 287:Evolutionary 262:Digitization 227:Agricultural 131:Mathematical 102:Econometrics 4006:von Neumann 3775:Supply-side 3760:Physiocracy 3704:Marginalism 3393:Information 3333:Engineering 3313:Development 3308:Demographic 3191:Game theory 3168:Theoretical 2474:Endogeneity 2434:IS–LM model 2428:AD–AS model 2374:free market 2345:S&P 500 2313:econometric 2230:credibility 2210:game theory 2200:econometric 2176:The law of 2112:. In 1730, 2092:mathematics 1966:price level 1949:falsifiable 1281:there is a 1216:(ARCH) and 1134:mathematics 1104:speculation 1045:Forecasting 995:cooperative 981:econometric 937:theoretical 684:von Neumann 337:Information 277:Engineering 257:Development 252:Demographic 194:Game theory 136:Methodology 32:IS/LM model 4253:Categories 4163:Economists 4036:Schumacher 3941:Schumpeter 3911:von Wieser 3831:von ThĂŒnen 3791:Economists 3690:Circuitism 3655:Humanistic 3650:Historical 3625:Ecological 3615:Democratic 3588:Chartalism 3578:Behavioral 3541:Mainstream 3502:Statistics 3497:Solidarity 3418:Managerial 3383:Humanistic 3378:Historical 3323:Ecological 3288:Behavioral 3102:H. Varian 2709:References 1755:derivative 1741:Regarding 1309:convention 1275:accounting 1200:and later 1194:hypotheses 1190:statistics 1170:stochastic 1100:investment 1085:businesses 1081:management 1069:allocation 1050:Proposing 991:complexity 843:Economists 714:Schumacher 619:Schumpeter 589:von Wieser 509:von ThĂŒnen 470:economists 446:Statistics 441:Solidarity 362:Managerial 327:Humanistic 322:Historical 267:Ecological 232:Behavioral 126:Mainstream 4081:Greenspan 4046:Samuelson 4026:Galbraith 3996:Tinbergen 3936:von Mises 3931:Heckscher 3891:Edgeworth 3770:Stockholm 3765:Socialist 3665:Keynesian 3645:Happiness 3605:Classical 3566:Mutualism 3561:Anarchist 3546:Heterodox 3443:Personnel 3403:Knowledge 3368:Happiness 3358:Financial 3328:Education 3303:Democracy 3238:Empirical 3160:Economics 2982:textbook. 2498:About.com 2096:De Moivre 2076:insurance 1986:computers 1882:∂ 1862:π 1853:∂ 1831:∂ 1810:− 1783:∂ 1714:− 1705:∂ 1685:− 1664:∂ 1649:∂ 1629:π 1626:∂ 1405:− 1390:− 1354:π 1198:Tinbergen 1077:logistics 1030:inflation 1026:Selection 945:variables 941:processes 759:Greenspan 724:Samuelson 704:Galbraith 674:Tinbergen 614:von Mises 609:Heckscher 569:Edgeworth 387:Personnel 347:Knowledge 312:Happiness 302:Financial 272:Education 247:Democracy 141:Political 107:Heterodox 50:Economics 4192:Category 4172:journals 4158:Glossary 4111:Stiglitz 4076:Rothbard 4056:Buchanan 4041:Friedman 4031:Koopmans 4021:Leontief 4001:Robinson 3886:Marshall 3736:Lausanne 3640:Georgism 3635:Feminist 3583:Buddhist 3573:Austrian 3472:Regional 3448:Planning 3423:Monetary 3353:Feminist 3298:Cultural 3293:Business 3024:(1938), 3022:Wold, H. 2990:(1939), 2888:(2007), 2859:(1976), 2722:(1982), 2532:Abstract 2505:Archived 2453:See also 2364:above). 2320:In 2004 2189:monetary 2185:time lag 2155:monetary 2080:gambling 1994:Leontief 1982:services 1338:taxation 1267:taxonomy 1138:validity 1065:Planning 1038:academic 999:resource 977:paradigm 971:Overview 931:economic 852:journals 838:Glossary 789:Stiglitz 754:Rothbard 734:Buchanan 719:Friedman 709:Koopmans 699:Leontief 679:Robinson 564:Marshall 468:Notable 416:Regional 392:Planning 367:Monetary 297:Feminist 242:Cultural 237:Business 42:a series 40:Part of 4207:Outline 4178:Schools 4170: ( 4131:Piketty 4126:Krugman 3991:Kuznets 3981:Kalecki 3956:Polanyi 3846:Cournot 3841:Bastiat 3826:Ricardo 3816:Malthus 3806:Quesnay 3709:Marxian 3600:Chicago 3530:history 3525:Schools 3512:Welfare 3482:Service 3273:Applied 3077:1500788 2952:(ed.), 2938:1884854 2820:4140287 2812:2296113 2699:1809376 2333:finance 2224:of non- 2128:in his 2126:Laplace 2049:History 1096:trading 1092:finance 1073:planned 1059:company 983:study. 949:logical 858:Schools 850: ( 809:Piketty 804:Krugman 669:Kuznets 659:Kalecki 634:Polanyi 524:Cournot 519:Bastiat 504:Ricardo 494:Malthus 484:Quesnay 456:Welfare 426:Service 97:Applied 73:Outline 68:History 4229:Portal 4116:Thaler 4096:Ostrom 4091:Becker 4086:Sowell 4066:Baumol 3971:Myrdal 3966:Sraffa 3961:Frisch 3951:Knight 3946:Keynes 3921:Fisher 3916:Veblen 3901:Pareto 3881:Menger 3876:George 3871:Jevons 3866:Walras 3856:Gossen 3780:Thermo 3458:Public 3453:Policy 3408:Labour 3373:Health 3075:  3010:  2972:  2936:  2900:  2871:  2842:  2818:  2810:  2768:  2749:  2730:  2718:& 2697:  2643:  2565:  2355:found. 2351:chaos 2339:study 2009:output 1974:vector 1968:, the 1964:, the 1962:output 1920:for a 1564:, and 1542:market 1430:where 1326:profit 1279:credit 1249:demand 1019:random 794:Thaler 774:Ostrom 769:Becker 764:Sowell 744:Baumol 649:Myrdal 644:Sraffa 639:Frisch 629:Knight 624:Keynes 599:Fisher 594:Veblen 579:Pareto 559:Menger 554:George 549:Jevons 544:Walras 534:Gossen 402:Public 397:Policy 352:Labour 317:Health 174:Market 4202:Lists 4197:Index 4148:Lists 4121:Hoppe 4106:Lucas 4071:Solow 4061:Arrow 4051:Simon 4016:Lange 4011:Hicks 3986:Röpke 3976:Hayek 3926:Pigou 3896:Clark 3811:Smith 3726:Mixed 3685:Post- 3507:Urban 3487:Socio 3477:Rural 3073:S2CID 2934:JSTOR 2816:S2CID 2808:JSTOR 2695:JSTOR 2666:(PDF) 2485:Notes 2267:chaos 2013:price 1990:price 1978:goods 1317:fraud 1301:money 1283:debit 1245:price 1218:GARCH 1108:bonds 1015:legal 953:model 935:is a 933:model 831:Lists 799:Hoppe 784:Lucas 749:Solow 739:Arrow 729:Simon 694:Lange 689:Hicks 664:Röpke 654:Hayek 604:Pigou 574:Clark 489:Smith 451:Urban 431:Socio 421:Rural 121:Macro 117:Micro 78:Index 4137:more 3861:Marx 3851:Mill 3836:List 3714:Neo- 3670:Neo- 3008:ISBN 2970:ISBN 2898:ISBN 2869:ISBN 2840:ISBN 2766:ISBN 2747:ISBN 2728:ISBN 2641:ISBN 2563:ISBN 2183:The 1980:and 1589:The 1204:are 1202:Wold 1102:and 1079:and 1067:and 1013:and 1005:and 815:more 539:Marx 529:Mill 514:List 4101:Sen 3821:Say 3680:New 3413:Law 3065:doi 2926:doi 2800:doi 2592:doi 2292:see 2220:'s 2159:GDP 2011:or 1976:of 1757:of 1336:of 1328:or 1273:An 1090:In 1083:of 979:of 928:An 779:Sen 499:Say 357:Law 4255:: 3071:. 3059:. 3055:. 3047:; 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Index

Economic system

IS/LM model
a series
Economics

History
Outline
Index
classifications
Applied
Econometrics
Heterodox
International
Micro
Macro
Mainstream
Mathematical
Methodology
Political
JEL classification codes
Economic systems
Economic growth
Market
National accounting
Experimental economics
Computational economics
Game theory
Operations research
Middle income trap

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