price distortions in agriculture and their effects an international comparison the central thesis of this paper is that agricultural pricing policies pursued by developing countries produce effects which are diametrically opposite to those produced by the pricing policies of many developed countries and that the policies of both are costly in terms of global welfare in general the agricultural sector in developing countries is heavily taxed while that in the developed countries receives substantial price protection the effects of agricultural price distortions on output consumption trade and rural employment are estimated for nine countries in addition the effects of price distortions on the distribution of income between producers and consumers on government revenue and foreign exchange and the net social losses of the policies are calculated the results indicate that there are large income transfers and impacts on migration from the rural to the urban sector in developing countries and from the urban to the rural sector in developed economies

rational heuristics expectations and behaviors in evolving economies with heterogeneous interacting agents we analyze the individual and macroeconomic impacts of heterogeneous expectations and action rules within an agent based model populated by heterogeneous interacting firms agents have to cope with a complex evolving economy characterized by deep uncertainty resulting from technical change imperfect information coordination hurdles and structural breaks in these circumstances we find that neither individual nor macroeconomic dynamics improve when agents replace myopic expectations with less naive learning rules our results suggest that fast and frugal robust heuristics may not be a second best option but rather rational responses in complex and changing macroeconomic environments jel c63 d8 e32 e6 o4

a comparison of economic agent based model calibration methods abstract despite significant expansion in recent years the literature on quantitative and data driven approaches to economic agent based model validation and calibration consists primarily of studies that have focused on the introduction of new calibration methods that are neither benchmarked against existing alternatives nor rigorously tested in terms of the quality of the estimates they produce in response we compare a number of prominent agent based model calibration methods both established and novel through a series of computational experiments in an attempt to determine the respective strengths and weaknesses of each approach overall we find that a simple likelihood based approach to bayesian estimation consistently outperforms several members of the more popular class of simulated minimum distance methods and results in reasonable parameter estimates in many contexts with a degradation in performance observed only when considering a large scale model and attempting to fit a substantial number of its parameters

project evaluation by potential tax reform abstract shadow prices are derived for small open economies with several production sectors experiencing constant returns to scale small projects affect the balance of trade domestic prices of non traded goods and factors and sector scales only domestic prices affect welfare and only if there is not domestic price equalization generally a project s net benefits depend upon the potential tax and tariff reform made possible or necessary through the balance of trade effect border prices are right for traded goods but domestic good shadow pricing requires knowing the direction of at least one reversible available tax reform and presuming optimality with respect to available reforms

an interdisciplinary model for macroeconomics macroeconomic modelling has been under intense scrutiny since the great financial crisis when serious shortcomings were exposed in the methodology used to understand the economy as a whole criticism has been levelled at the assumptions employed in the dominant models particularly that economic agents are homogeneous and optimizing and that the economy is equilibrating this paper seeks to explore an interdisciplinary approach to macroeconomic modelling with techniques drawn from other natural and social sciences specifically it discusses agent based modelling which is used across a wide range of disciplines as an example of such a technique agent based models are complementary to existing approaches and are suited to answering macroeconomic questions where complexity heterogeneity networks and heuristics play an important role

rewards to academia the remuneration of vice chancellors and principals this paper models the financial remuneration to vice chancellors and principals at uk higher education institutions after describing the alternative theoretical underpinnings for the determination of pay an earnings function is estimated utilizing institutional and personal characteristics the model suggests only a partial linkage of managerial and performance related indicators to remuneration levels this suggests substantial scope for reorientation of rewards towards such indicators rather than relying on an efficiency wage this would appear particularly appropriate given the present and continued disclosure of this information together with the increased focus on performance indicators relating to teaching and research within the uk higher education sector

welfare analysis of tax reforms using household data abstract this paper discusses a methodology for calculating the distribution of gains and losses from a policy change using data for a large sample of households estimates are based on the equivalent income function which is money metric utility defined over observable variables this enables calculations to be standardised and a computer program to compute the statistics presented in the paper is available for a general demand system equivalent income is related to measures of deadweight loss and standard errors are computed for each of the welfare measures an application to u k data for 5 895 households is given which simulates a reform that involves eliminating housing subsidies

forming priors for dsge models and how it affects the assessment of nominal rigidities abstract we discuss prior elicitation for the parameters of dynamic stochastic general equilibrium dsge models and provide a method for constructing prior distributions for a subset of these parameters from beliefs about steady state relationships and second moments of the endogenous variables the empirical application documents how the specification of the prior distribution affects our assessment of the relative importance of price and wage rigidities in a new keynesian dsge model

fiscal and monetary policies in complex evolving economies what is the most appropriate combination of fiscal and monetary policies in economies subject to banking crises and deep recessions we study this issue using an agent based model that is able to reproduce a wide array of macro and micro empirical regularities simulation results suggest that policy mixes associating unconstrained counter cyclical fiscal policy and monetary policy targeting employment is required to stabilise the economy we also show that discipline guided fiscal rules can be self defeating as they depress the economy without improving public finances finally we find that the effects of monetary and fiscal policies become sharper as the level of income inequality increases

the theory of taxation for developing countries tax policy has far reaching implications for economic development and public administration this book which presents a modern theory of public finance brings together many of the most distinguished economists who have written on the subject they provide coherent principles for tax design and a systematic framework for the analysis of practical questions of tax reform and pricing policy in developing countries the book is especially timely as countries experience increasing shortages of government revenue and the distortions brought about by poorly designed tax systems it pays particular attention to the special problems of developing countries such as the taxation of agriculture the aim throughout is to develop techniques that can be quantitatively applied given the data available and empirical case studies illustrate the methods in action the authors analyze the links between tax theory social cost benefit analysis and the pricing of publicly supplied goods and services they also explore the empirical and econometric problems of identifying the tradeoffs between equity and efficiency other topics treated include the analysis of labor markets the taxation of foreign private investment and of fuel and the pricing of education although the models used concentrate on developing countries most of the methods and discussion apply as well to the problems of more affluent countries

an economic approach to influence activities in organizations members of organizations spend considerable time effort and ingenuity attempting to influence decision makers such influence activities may bring benefits to the organization but they also involve real costs this essay offers an economic rationale for such influence activity as representing rational self interested behavior in the presence of informational asymmetries and an analysis of how the design of the organization s structure and policies should respond to the incentives for attempting influence it is posited that information valuable for the organization s decision making is directly available only to members of the organization who have some personal stake in the decisions these individuals may then have an incentive to try to manipulate the information they develop and provide in order to influence the resulting decisions to their benefits this can be costly both in degrading the quality of decision making and in diverting the attention and effort of the organization s members from more productive activities the organization has three different methods it can employ to discourage excessive influence activities and to encourage more directly productive uses of time and effort it can limit access to decision makers and participation in decision making it can alter its decision making criteria to favor those performing well in productive activities and it can provide direct financial incentives to encourage the desired allocation of effort it is shown that an efficiently designed organization will use such financial incentives only as a last resort instead it will always first alter its decision participation policies and decisionmaking criteria

a method for taking models to the data abstract this paper develops a method for combining the power of a dynamic stochastic general equilibrium model with the flexibility of a vector autoregressive time series model to obtain a hybrid that can be taken directly to the data it estimates this hybrid model via maximum likelihood and uses the results to address a number of issues concerning the ability of a prototypical real business cycle model to explain movements in aggregate output and employment in the postwar us economy the stability of the real business cycle model s structural parameters and the performance of the hybrid model s out of sample forecasts

are workers paid their marginal products status is like coase s social costs a reciprocal phenomenon given that one person s gain in status can occur only at the expense of a loss in status for others and that workers are free to choose their coworkers it follows that the competitive wage structure within a firm must be one in which individual wage differences understate individual differences in marginal products the purpose of this paper is to examine a variety of empirical evidence that relates to this proposition about the firm s internal wage structure the paper is organized as follows section i briefly summarizes the theoretical considerations that govern competitive wage determination when status matters to people and firms are viewed as voluntary associations of workers section ii then confronts the predictions of section i by examining pay and productivity schedules for a group of sales occupations for which these schedules are relatively easily observed section ii also examines the relationship between wages and productivity for a sample of university professors an occupation in which individual productivity differences are for a variety of obvious reasons relatively more difficult to measure all of the evidence examined is consistent with the hypothesis that within firms wage rates vary substantially less than do individual productivity values section iii discusses additional observations and evidence that bear on this same hypothesis it suggests that the implicit market for status may strongly influence the ways in which firms are organized to carry out the tasks they perform section iv concludes by considering the claim that egalitarian internal wage structures arise because of equity considerations it argues that the concept of equity appears very closely linked to the concept of status and suggests a strategy for assigning monetaty value to the equity considerations that so often dominate public policy decisions

the intrinsic limits of modern economic theory the emperor has no clothes assumptions of the uniqueness and stability of general equilibrium in a walrasian framework have no theoretical justification this paper argues that the key reason for this is that the walrasian model treats people as acting independently of one another especially in their demand behavior this independence plays an essential role in constructing economies with arbitrary excess demand functions thus making individual behavior dependent or similar may open the way to obtaining meaningful restrictions on aggregate excess demand functions copyright 1989 by royal economic society

the dynamic effects of aggregate demand and supply disturbances we interpret fluctuations in gnp and unemployment as due to two types of disturbances disturbances that have a permanent effect on output and disturbances that do not we interpret the first as supply disturbances the second as demand disturbances demand disturbances have a hump shaped mirror image effect on output and unemployment the effect of supply disturbances on output increases steadily over time peaking after two years and reaching a plateau after five years

modeling macroeconomies as open ended dynamic systems of interacting agents uall models are wrong but some are useful g e p box 1979 macroeconomists seek to understand the structure and performance of economies at a national or regional level and the manner in which government policymakers attempt to influence this structure and performance over time such understanding would seem to require a systematic exploration of the intricate feedback loops connecting micro behaviors interaction patterns and macro regularities as observed in real world economies

quantifying the concerns of dimon and buffett with data and computation abstract despite considerable efforts the determinants of firm growth and financial market volatility have not been definitively identified yet sets of stylized facts most notably power law distributions relating to firm size and market returns suggest both evolve as part of a complex system this scenario implies that a positive feedback loop between firms and investors exists and may be responsible for prejudicing the way management allocates their resources with firm and economic growth adversely affected further there are growing real world concerns that the management of publicly listed firms is becoming too concerned with the movement of their firm s share price which is adversely influencing resource allocation decisions a related concern is that agents in general within financial markets are placing a disproportionate focus on short term factors to investigate the ramifications of the proposed feedback loop on firm growth and market volatility this paper implements a novel agent based artificial stock market where management can consider the movements of their firm s endogenously determined share price when allocating resources between sales and margin growth the results highlight an inferior outcome regarding firm growth and various other financial metrics if management is overly concerned with share price movements the growth of the firms and market is also affected by the mixture of the investor classes initiated due to the divergent levels of volatility they create additionally the model presents insights into how and why the extent to which agents consider past outcomes in their decision making process becomes influential notably the model s results emulate an extensive set of global micro level firm data by providing significant insights on the effects of the stock market on management decision making and its ramifications for firm growth this paper provides crucial insights into the mechanisms responsible for inefficient behavior by market participants

income distribution credit and fiscal policies in an agent based keynesian model this work studies the interactions between income distribution and monetary and fiscal policies in terms of ensuing dynamics of macro variables gdp growth unemployment etc on the grounds of an agent based keynesian model the direct ancestor of this work is the keynes meeting schumpeter formalism presented in dosi et al 2010 to that model we add a banking sector and a monetary authority setting interest rates and credit lending conditions the model combines keynesian mechanisms of demand generation a schumpeterian innovation fueled process of growth and minskian credit dynamics the robustness of the model is checked against its capability to jointly account for a large set of empirical regularities both at the micro level and at the macro one the model is able to catch salient features underlying the current as well as previous recessions the impact of financial factors and the role in them of income distribution we find that different income distribution regimes heavily affect macroeconomic performance more unequal economies are exposed to more severe business cycles fluctuations higher unemployment rates and higher probability of crises on the policy side fiscal policies do not only dampen business cycles reduce unemployment and the likelihood of experiencing a huge crisis in some circumstances they also affect positively long term growth further the more income distribution is skewed toward profits the greater the effects of fiscal policies about monetary policy we find a strong non linearity in the way interest rates affect macroeconomic dynamics in one regime with low rates changes in interest rates are ineffective up to a threshold beyond which increasing the interest rate implies smaller output growth rates and larger output volatility unemployment and likelihood of crises

project appraisal and foreign exchange constraints a comment a paper in this journal by blitzer dasgupta and stiglitz i98i hereinafter bds entitled project appraisal and foreign exchange constraints examines the implications of various non optimal macroeconomic adjustment policies for project evaluation the discussion is presented in terms of a simple two good one consumer economy with price distortions which lead the ratio of the domestic price of the exported good e to the domestic price of the imported good i to be greater than the internati onal price ratio it is argued that the resulting trade gap will force the government to pursue an adjustment policy which may take the form of taxation of income or commodities rationing or foreign borrowing and it is shown that the choice of policy will determine the appropriate shadow price formulae to be used in project appraisal the view that world prices provide shadow prices for traded goods is argued to be correct for some but not all of the macroeconomic policies considered this comment argues that the bds analysis fails to specify how tax revenue is to be incorporated in the model as a result the various policy options open to the government are not clearly brought out we set out below in section i an amplified version of the bds general equilibrium model which includes tax revenue and use it to show how the different adjustment mechanisms have to be related to the public sector budget constraint in section ii we reconsider their analysis and show that if either an income or a commodity tax on the importable is used to ensure public sector balance then world prices remain shadow prices for traded goods in section iii we make the point that the presence of import tariffs does not imply in the context of a real general equilibrium model that the balance of payments constraint will be violated the conclusion is drawn that endogenous foreign borrowing cannot be analysed without respecifying the basic bds model our comment is confined to the problem of shadow pricing traded goods in the bds model we do not consider rationing as a means of macroeconomic adjustment policy nor do we comment on their section iii where they analyse the additional problems which follow from introducing a non traded commodity into the model

pay equality and industrial politics personnel managers often argue that equitable pay treatment manifested as wage compression is useful because it reduces disharmony among workers but it is far from obvious that a compressed salary structure is morale improving since better workers may feel disenchanted by this scheme however when workers rewards are based on relative comparisons salary compression reduces uncooperative behavior that is detrimental to the firm relative comparisons imply that some reference group must be selected the major result is that within the relevant groups some wage compression is efficient

executive compensation and principal agent theory the empirical literature on executive compensation generally fails to specify a model of executive pay on which to base and test hypotheses regarding its determinants in contrast this paper analy

validation in agent based models an investigation on the cats model abstract in this paper we deal with some validation experiments on the complex adaptive trivial system cats model proposed in gallegati et al gallegati m giulioni g palestrini a delli gatti d 2003a financial fragility patterns of firms entry and exit and aggregate dynamics journal of economic behavior and organization 51 79 97 gallegati m delli gatti d di guilmi c gaffeo e giulioni g palestrini a 2005 a new approach to business fluctuations heterogeneous interacting agents scaling laws and financial fragility journal of economic behavior and organization 56 489 512 in particular starting from a sample of italian firms included in the aida database we perform several ex post validation experiments over the simulation period 1996 2001 in the experiments the model parameters have been estimated using actual data and the initial set up consists of a sample of agents in 1996 the cats model is then simulated over the period 1996 2001 using alternative validation techniques the simulations results are ex post validated respect to the actual data

the theory of reform and indian indirect taxes abstract given a set of value judgements an initial state and a model of the economy one can ask whether some feasible tax change would increase welfare we do this by defining the marginal cost in terms of welfare of raising an extra rupee from the i th good the inverse optimum problem is the calculation of non negative welfare weights on households which imply that the initial state is optimum if no such welfare weights exist then a pareto improvement is possible we illustrate the concepts and results using data from the indian economy for 1979 1980 directions of tax reform for a number of specific social welfare functions and for pareto improvements are presented

tax reform from the gradient projection viewpoint abstract this paper examines the problems of gradual tax reform desirable small moves of the tax system are determined using the principles of the well known gradient projection algorithm three classical models of public finance are considered for each of them a continuous time dynamic process is exhibited along which the social welfare function increases until convergence to local second best extrema although the selection of trajectories according to the gradient projection method has some arbitrariness it leads to intuitively and economically appealing rules such as a tax reform analog of the classical optimal taxation result on production efficiency

what matters most teaching or research empirical evidence on the remuneration of british academics this paper examines the impact of productivity on pay within academia drawing upon a detailed dataset of academics from five old established universities results outline the importance of publication grant receipt and teaching quality in the determination of pay a large financial penalty to time out of the profession is revealed which with productivity variables explains away the gender salary gap the relationship between teaching and research is investigated and we find some evidence in support of the hypothesis that productive researchers are successful teachers results on reservation salary suggest that the best academics are willing to stay within the profession

a traditional interpretation of macroeconomic fluctuations under the traditional interpretation of macroeconomic fluctuations aggregate demand shocks move output and prices in the same direction while aggregate supply shocks move output and prices in opposite directions this paper examines the joint behavior of u s output unemployment prices wages and nominal money and asks whether it is consistent with this interpretation the answer is a qualified yes

the recognition and reward of employee performance this paper examines when and to what extent an individual s relative wage depends on his her productivity relative to others doing the same job starting wages were influenced by background characteristics and training cost realizations but not by relative productivity wages one year later were influenced by productivity but the effects were small the wage elasticity was 2 at small establishments and 0 at establishments with over 400 employees the wage response to relative productivity and training costs was weaker in small labor markets suggesting that wages do not fully respond to performance because of the firm specificity of job performance differentials

public investment and real price supports abstract the social rate of return to public investment in industries with fixed real price supports is studied using a simple general equilibrium model fixed real price supports are shown to enhance the likelihood of immiserizing growth due to capital accumulation or technological innovation in the supported sector general conditions under which an intervention price will induce a negative social rate of return to public investment are derived

optimal taxes and the structure of preferences if optimal tax theory is to be the basis for calculating tax rates a close understanding is required of the relationship between the structure of preferences and the configuration of optimal tax rates otherwise hypotheses chosen by the econometrician for practical convenience may completely determine the results independently of measurement this paper explores the relationship between various types of separability particularly weak and implicit separability and optimal tax rates in the various models discussed in the literature the use of distance functions and the antonelli matrix provides a significant unification of previously disparate results in the final analysis optimal tax theory should be the basis for actual calculation of tax rates although recently there have been great advances in theoretical results and in our understanding of their meaning we are still some way from a working knowledge of whether uniform commodity taxes are in practice optimal or if not which commodities should be discriminated against present theoretical formulae do not yield clear cut results except in special cases and it has recently become clear that optimal rates depend crucially on the detailed structure of consumer preferences for example atkinson and stiglitz 3 show that with an optimal nonlinear income tax discriminatory commodity taxes are only necessary to the extent that individual commodities are not weakly separable from leisure more recently deaton 6 has shown that a similar result holds for what is perhaps the most interesting of the standard models that where there are many consumers and only a linear income tax and proportional commodity taxes are allowed in this case separability between goods and leisure together with linear engel curves for goods removes the need for differential commodity taxation in consequence nothing can be learned about commodity taxes from consumer demand studies in which commodity demands are explained conditionally on total expenditure and commodity prices and which assume linear engel curves all such studies require separability from leisure as a maintained hypothesis and so are consistent with uniform commodity taxation these results suggest that the prospects for meaningful empirical calculations of tax rates are bleak econometricians estimating commodity demand and labor supply equations make generous use of separability assumptions to enable estimation at all in consequence it is likely that empirically calculated tax rates based on econometric estimates of parameters will be determined in structure not by the measurements actually made but by arbitrary untested and even unconscious hypotheses chosen by the econometrician for practical convenience to remedy this situation and as a prelude to fruitful empirical work it is necessary to have a more explicit understanding of how preference structure affects optimal tax rates such is the object of this paper three different

causal parameters and policy analysis in economics a twentieth century retrospective the major contributions of twentieth century econometrics to knowledge were the definition of causal parameters within well defined economic models in which agents are constrained by resources and markets and causes are interrelated the analysis of what is required to recover causal parameters from data the identification problem and clarification of the role of causal parameters in policy evaluation and in forecasting the effects of policies never previously experienced this paper summarizes the development of these ideas by the cowles commission the response to their work by structural econometricians and var econometricians and the response to structural and var econometrics by calibrators advocates of natural and social experiments and by nonparametric econometricians and statisticians this paper considers the definition and identification of causal parameters in economics and their role in econometric policy analysis it assesses different research programs designed to recover causal parameters from data at the beginning of this century economic theory was mainly intuitive and empirical support for it was largely anecdotal at the end of the century economics has a rich array of formal models and a high quality database empirical regularities motivate theory in many areas of economics and data are routinely used to test theory many economic theories have been developed as measurement frameworks to suggest what data should be collected and how they should be interpreted econometric theory was developed to analyze and interpret economic data most econometric theory adapts methods originally developed in statistics the major exception to this rule is the econometric analysis of the identification problem and the companion analyses of structural equations causality and economic policy evaluation although an economist did not invent the phrase correlation does not imply causation 1 economists clari

a method for agent based models validation abstract this paper proposes a new method to empirically validate simulation models that generate artificial time series data comparable with real world data the approach is based on comparing structures of vector autoregression models which are estimated from both artificial and real world data by means of causal search algorithms this relatively simple procedure is able to tackle both the problem of confronting theoretical simulation models with the data and the problem of comparing different models in terms of their empirical reliability moreover the paper provides an application of the validation procedure to the agent based macroeconomic model proposed by dosi et al 2015

interactive vs non interactive knowledge production by faculty members in this article we develop a model of individual choice to study the determinants of faculty members allocation of effort between interactive and noninteractive activities this model is tested by using censored and discrete choice econometric models to estimate optimum effort allocated to interactive activities and real interaction we conclude first that individual responds to nonmonetary rather than monetary incentives and to the difficulty of producing noninteractive rather than interactive knowledge second we detect the possible existence of rationing since optimum effort and real interaction depend on different variables

corporate performance and managerial remuneration an empirical analysis abstract economic theories of efficient compensation predict a positive relationship between executive pay and corporate performance and yet efforts to document this relationship have been largely unsuccessful in this paper we argue that previous cross sectional studies have omitted important variables which seriously bias their results using data that focus on individual executives over time we find that executive compensation is strongly positively related to corporate performance as measured by shareholder return and growth in firm sales the results are robust to the stock market performance measure utilized

tax reform and temporary inefficiency abstract if any type of direct income redistribution is permitted a very weak condition ensures that it will not be desirable or necessary to permit production inefficiency in the process of a pareto improving tax reform inefficiency arises in models which make an implausible set of assumptions about the range of policies available to the government

when groups contribute to a public good the importance of institutional framework for making collective decisions in this paper i discuss how the institutional framework for making collective decisions influences the outcome of a game where groups contribute to a public good representative democracy invites each group to act strategically in the election of representatives i show that this strategic effect reinforces the tragedy of the common the society all groups taken together has therefore incentives to restrict groups from making collective decisions through a system of representation

seniority and monopsony in the academic labor market workers with high seniority usually have higher wages than workers with low seniority and the same total labor marke t experience in contrast the results of this paper indicate that higher seniority is associated with lower salaries for university professors the author documents this finding for national surveys a nd individual institutions and explains it as due to monopsonistic discrimination by employers copyright 1993 by american economic association

optimal trade taxes on agriculture in developing countries subsistence foodcrops and incomes are hard to tax in developing countries it is easy and common to tax agricultural imports and exports if domestic transactions cannot be taxed how should agricultural trade taxes be set and how should indirect taxes on nonagricultural consumer goods be set this paper derives and quantifies formulas for the optimal export tax on a nonfood agricultural product ghanaian cocoa in which the country has market power and the level of indirect taxes on taxable consumer goods it asks whether starting from free trade on cereals there should be import tariffs or subsidies copyright 1990 by royal economic society

schumpeter meeting keynes a policy friendly model of endogenous growth and business cycles this paper studies an agent based model that bridges keynesian theories of demandgeneration and schumpeterian theories of technology fueled economic growth we employ the model to investigate the properties of macroeconomic dynamics and the impact of public polices on supply demand and the fundamentals of the economy we find profound complementarities between factors influencing aggregate demand and drivers of technological change that affect both short run fluctuations and longterm growth patterns from a normative point of view simulations show a corresponding complementarity between keynesian and schumpeterian policies in sustaining long run growth paths characterized by milder fluctuations and relatively lower unemployment levels the matching or mismatching between innovative exploration of new technologies and the conditions of demand generation appear to suggest the presence of two distinct regimes of growth or absence thereof characterized by different short run fluctuations and unemployment levels

priors from general equilibrium models for vars abstract this paper uses a simple new keynesian dynamic stochastic general equilibrium model as a prior for a vector autoregression shows that the resulting model is competitive with standard benchmarks in terms of forecasting and can be used for policy analysis jel classification c11 c32 c53 key words bayesian analysis dsge models forecasting vector autoregressions 1 introduction dynamic stochastic general equilibrium dsge models are popular nowadays in macroeconomics they are taught in virtually every economics ph d program and represent a predominant share of publications in the field yet when it comes to policy making these models are scarcely used at least from a quantitative point of view the main quantitative workhorse for policy making at the federal reserve system is frb us a macro econometric model built in the cowles foundation tradition a style of macroeconomics that is no longer taught in many ph d programs 1 in their decision process fed policy makers rely heavily on forecasting they want to know the expected path of inflation in the next few quarters and by how much a 50 basis point increase in the federal funds rate would affect that path frb us offers answers to these questions answers that many macroeconomists would regard with suspicion given both the lucas 1976 critique and the fact that in general the restrictions imposed by cowles foundation models are at odds with dynamic general equilibrium macroeconomics sims 1980 general equilibrium models on the other hand have a hard time providing alternative answers the fact that these models are perceived to do badly in terms of forecasting as they are scarcely parameterized is perhaps one of the reasons why they are not at the forefront of policy making while progress is being made in the development of dsge models that deliver acceptable forecasts e g smets and wouters 2003 this paper proposes an approach that combines a stylized general equilibrium model with a vector autoregression var to obtain a specification that both forecasts well and is usable for policy analysis specifically the approach involves using prior information coming from a dsge model in the estimation of a vector autoregression loosely speaking this prior can be thought of as the result of the following exercise i simulate time series data from the dsge model ii fit a var to these data in practice we replace the sample moments of the simulated data by population moments computed from the dsge model solution since the dsge model depends on unknown structural parameters we use a hierarchical prior in our analysis by placing a distribution on the dsge model parameters a tightness parameter controls the weight of the dsge model prior relative to the weight of the actual sample markov chain monte carlo methods are used to generate draws from the joint posterior distribution of the var and dsge model parameters the paper shows that the approach makes even a fairly stylized new keynesian dsge model competitive with standard benchmarks in terms of forecasting real output growth inflation and the nominal interest rate the three variables that are of most interest to policy makers 2 up to this point our procedure borrows from the work of dejong ingram and whiteman 1993 and ingram and whiteman 1994 who are the first to use priors from dsge models for vars ingram and whiteman showed that prior information from the bare bones stochastic growth model of king plosser and rebelo 1988 is helpful in forecasting real economic activity such as output consumption investment and hours worked in addition to documenting the forecasting performance of a trivariate var with a prior derived from a monetary dsge model this paper makes two contributions that significantly extend the earlier work first we show formally how posterior inference for the var parameters can be translated into posterior inference for dsge model parameters

agricultural pricing and public investment abstract aggregate agricultural supply is price inelastic but responsive to investment in agricultural infrastructure irrigation roads research extension thus the government should tax agriculture and finance infrastructure although unlikely to pay for itself directly it will increase taxable agricultural surplus but by raising rural living standards and therefore the supply price of urban labour it reduces urban tax revenue its marginal social product is therefore overstated when measured at world prices though understated at distorted agricultural prices with scale economies in industry the case for taxing and investing in agriculture is strengthened it may allow the economy to escape stagnation

a calibration procedure for analyzing stock price dynamics in an agent based framework in this paper we introduce a calibration procedure for validating of agent based models starting from the well known nancial model of brock and hommes 1998 we show how an appropriate calibration enables the model to describe price time series we formulate the cal ibration problem as a nonlinear constrained optimization that can be solved numerically via a gradient based method the calibration re sults show that the simplest version of the brock and hommes model with two trader types fundamentalists and trend followers replicates nicely the price series of four dierent markets indices the s p 500 the euro stoxx 50 the nikkei 225 and the csi 300 we show how the parameter values of the calibrated model are important in interpret ing the trader behavior in the dierent markets investigated these parameters are then used for price forecasting to further improve the forecasting we modify our calibration approach by increasing the trader information set finally we show how this new approach im proves the model s ability to predict market prices

the computational experiment an econometric tool an economic experiment consists of the act of placing people in an environment desired by the experimenter who then records the time paths of their economic behavior performing experiments that use actual people at the level of national economies is obviously not practical but constructing a model economy and computing the economic behavior of the model s people is such experiments are termed computational this essay specifies the steps in designing a computational experiment to address some well posed quantitative question the authors emphasize that the computational experiment is an econometric tool used in the task of deriving the quantitative implications of theory

direct comparison of agent based models of herding in financial markets abstract the present paper tests a new model comparison methodology by comparing multiple calibrations of three agent based models of financial markets on the daily returns of 24 stock market indices and exchange rate series the models chosen for this empirical application are the herding model of gilli and winker 2003 its asymmetric version by alfarano et al 2005 and the more recent model by franke and westerhoff 2011 which all share a common lineage to the herding model introduced by kirman 1993 in addition standard arch processes are included for each financial series to provide a benchmark for the explanatory power of the models the methodology provides a consistent and statistically significant ranking of the three models more importantly it also reveals that the best performing model franke and westerhoff is generally not distinguishable from an arch type process suggesting their explanatory power on the data is similar

macroeconomic simulation comparison with a multivariate extension of the markov information criterion abstract the paper aims to address the issue of comparing agent based models abms with more traditional var and dsge models by developing a multivariate extension of the markov information criterion mic of barde 2017 the univariate mic measures the informational distance between a simulation model and some empirical data by mapping the simulated data to a markov transition matrix and is proven to provide an unbiased measurement for all models reducible to a markov process as a result the mic can accurately measure distance using only simulated data for a wide class of data generating processes the paper first presents the multivariate extension of the mic and its validation on var and dgse models before carrying the first direct comparison between a macroeconomic abm and a dgse model namely the benchmark abm of caiani et al 2016 and smets and wouters 2007

the incidence of agricultural policies abstract a general equilibrium model is used to analyze agricultural policy incidence in the presence of distortionary income taxation the incidence of lump sum transfers to farmers supply control through input retirement and production subsidies are considered partial equilibrium incidence calculations are shown to systematically overstate the benefits farmers receive from farm programs kaldor s compensation test is used to judge the relative efficiency inefficiency of alternative farm programs at the margin supply control through input retirement may dominate decoupled lump sum transfers if the tax system is very inefficient and subsidy payments are high

estimation of an agent based model of investor sentiment formation in financial markets abstract we use weekly survey data on short term and medium term sentiment of german investors to estimate the parameters of a stochastic model of opinion formation governed by social interactions the bivariate nature of our data set also allows us to explore the interaction between the two hypothesized opinion formation processes while consideration of the simultaneous weekly changes of the stock index dax enables us to study the influence of sentiment on returns technically we extend the maximum likelihood framework for parameter estimation in agent based models introduced by lux 2009a by generalizing it to bivariate and tri variate settings as it turns out our results are consistent with strong social interaction in short run sentiment while one observes abrupt changes of mood in short run sentiment medium term sentiment is a more slowly moving process in which the influence of social interaction seems to be less pronounced the tri variate model entails a significant effect from short run sentiment on prices in sample but its out of sample predictive performance does not beat the random walk benchmark