on the role of government in a stochastically growing open economy abstract the relationship between the size of government economic growth and volatility in a small open economy is analyzed first we characterize the stochastic equilibrium for a centrally planned economy contrasting it with a closed economy the role of government consumption expenditure both as a stabilizing and a destabilizing factor is discussed the optimal size of government is derived and we find that an open economy will have a larger government if and only if it is a net creditor second the stochastic equilibrium in a decentralized economy is characterized and the optimal tax structure derived finally the role of government production expenditure and its impact on risk is briefly discussed

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

optimal fiscal policy in a business cycle model with public capital in this paper a real business cycle model with optimal tax rates government borrowing and productive public capital is analysed a specification that allows for multiple stochastic shocks to technology and preferences can reproduce some key features describing the cyclical behaviour of postwar u s fiscal policy the optimally chosen policy variables fluctuate substantially over the business cycle but they do not operate like automatic stabilizers jel classification e62 e32 politiquefiscale optimale dans un modee de cycle d affaires avec capital public ce m6moire analyse un modele de cycle d affaires r6el avec taux d imposition optimaux emprunts gouvernementaux et capital public productif une sp6cification de ce modele qui enregiste plusieurs chocs stochastiques affectant technologie et pr6f6rences peut reproduire quelquesunes des caract6ristiques d6crivant le comportement cyclique de la politique fiscale d apres guerre des etats unis les variables correspondant a la politique optimale choisie fluctuent substantiellement au cours du cycle mais n operent pas comme des stabilisateurs automatiques

increasing returns capital utilization and the effects of government spending abstract we show that a one sector real business cycle model with mild increasing returns to scale variable capital utilization and saddle path stability is able to produce qualitatively realistic business cycles driven solely by disturbances to government purchases due to an endogenous increase in labor productivity a positive spending shock can lead to simultaneous increases in output consumption investment employment and real wage our analysis illustrates a close relationship between this result and the recent literature that explores indeterminacy and sunspots in real business cycle models under laissez faire in particular the condition which governs the required magnitude of increasing returns for government spending shocks to generate procyclical macroeconomic effects is identical to that necessary for a laissez faire one sector real business cycle model to exhibit local indeterminacy

inter industry strategic r d and supplier demander relationships abstract this paper investigates if the r d of an industry changes due to the r d of an industry s suppliers and or demanders using an annual industry level panel of manufacturing r d in the united states i find that regressing the r d of an industry on the lagged values of another industry s r d suggests r d comovement between industries with a strong supplier demander relationship variance decompositions indicate that the r d of an industry has high forecasting power over the r d variance of another industry if the two industries share a strong supplier demander relationship

optimal taxation in models of endogenous growth we study the problem of optimal taxation in three infinite horizon representative agent endogenous growth models the first model is a convex model in which physical and human capital are perfectly symmetric our second model incorporates elastic labor supply through a lucas style technology analysis of these two models points out the danger of assuming that government expenditures are exogenous in our third model we include government expenditures as a productive input in capital formation showing that the limiting tax rate on capital is no longer zero in numerical simulations we find similar effects on growth and welfare in all three models

business cycles and long run growth in this survey we discuss the effect of macroeconomic fluctuations on long run growth from both a theoretical and empirical perspective we emphasize the opportunity cost approach which states that firms will intertemporally substitute productivity enhancing activities for regular production activity during recessions we provide aggregate evidence in favor of the opportunity cost approach copyright 1997 by oxford university press

public capital asymmetric information and economic growth we investigate the provision of public capital in an endogenous growth model with asymmetric information in a credit market with costly screening we show that the equilibrium contracts are characterized by the self selection of borrowers through identifying an additional adverse effect of taxation on growth we show that the optimal tax rate in our model is smaller than the output elasticity of public capital therefore our analysis justifies a more conservative tax policy in the presence of asymmetric information furthermore our model suggests a number of implications that appear to be well supported by preliminary evidence in cross country data jel classification d82 h21 041

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

schooling and public capital in a model of endogenous growth this paper studies the allocation of public spending between education services and infrastructure investment in an endogenous growth model where public capital in infrastructure affects the process of human capital accumulation the balanced growth path is derived and the dynamics associated with a budget neutral reallocation of spending from education to infrastructure are studied through numerical simulations the growth maximizing tax rate is shown to depend only on the production technology as in standard flow models of public expenditure whereas the optimal share of infrastructure investment depends also on the productiveness of infrastructure relative to education services in the schooling technology

innovative activity over the business cycle this paper examines cyclical patterns of innovative activity in the united kingdom over the period 1948 83 innovative activity turns out to have many of the properties of a random walk but does show a tendency to cluster during booms there is clear evidence of a long term secular relation between the level of innovative activity and the level of economic activity although this may have changed in the 1980s finally the data provide no reason for thinking that these clusters of innovation cause cyclic variations in economic activity but variations in economic activity do granger cause changes in innovative activity copyright 1995 by royal economic society

effects of mineral commodity price shocks on monetary policy in developed countries this article investigates effects of changes in mineral commodity prices on monetary policy using macroeconomic data from three mineral producing countries australia canada and new zealand and two non mineral resource countries usa and uk i estimate the impulse response functions of the policy interest rates and the core consumer price index cpi inflation rates to mineral commodity price shocks i find that the central banks in both groups of the examined countries significantly respond to mineral commodity price shocks in responses to an unexpected 10 increase in mineral commodity prices the central banks are estimated to increase their policy interest rates by approximately 0 8 percentage points moreover the central banks seem to take anticipatory policy reactions to control core cpi variations triggered by these shocks thus mineral commodity prices would act as important determinants of the monetary policies in both groups of the examined countries these findings would be useful for an

costly intermediation and the poverty of nations this article has two goals i to reduce the 7 fold productivity differential required to explain the observed 33 fold income difference between the richest and poorest countries of the world and ii to explain cross country differences in the capital output ratio to achieve the first goal we modify the production function of the standard neoclassical growth model to include public capital whose provision is subject to intermediation costs for the second goal we distort private investment by introducing credit frictions the model quantified using cross country data generates an income gap of 33 with productivity differences of only 3 under the measured variations in public and private capital the required productivity gap declines even further to 2 1 when we introduce a home production sector on the second goal however credit frictions do a poor job of explaining cross country variations in the capital output ratio

buffer stock money interpreting short run dynamics using long run restrictions time series techniques are used to assess the quantitative importance of buffer stock money the short run response of real money holdings to nominal money supply shocks the empirical model a vector autoregression of real and nominal money balances captures general dynamic properties of the time series but requires theoretical restrictions for sensible interpretation the authors just identify the system by imposing a long run neutrality restriction nominal money shocks have no permanent effects on real money they find that buffer stock effects play an important role in the evolution of real m1 in the short run the evidence for m2 is less conclusive copyright 1994 by ohio state university press

rent seeking bureaucracies and oversight in a simple growth model abstract following recent cross country empirical work research on public policy and growth has come to examine the impact of inefficient or corrupt bureaucracies most of this work has emphasized the interactions of bureaucracies with private markets by contrast this paper focuses on the relationship between rent seeking bureaucracies and their political authority we show that when oversight is relatively costly as in many developing economies the political authority exercises little monitoring of its agencies which reduces the effectiveness of productive government spending moreover when the technology used to provide public services is poor bureaus better succeed in requesting overly large budgets before triggering any monitoring both of these characteristics contribute to reducing the growth rate of already poor economies

growth effects of flat rate taxes recent estimates of the potential growth effects of tax reform vary wildly ranging from zero to eight percentage points using an endogenous growth model we assess which model features and parameter values are important for determining the quantitative impact of tax reform we find that the critical parameters are factor shares depreciation rates the elasticity of intertemporal substitution and the elasticity of labor supply the elasticities of substitution in production on the other hand are relatively unimportant the quantitative estimates in several recent papers are compared with each other and with some of the evidence from u s experience we find that robert lucas s conclusion that tax reform would have little or no effect on the u s growth rate is theoretically robust and consistent with the evidence

the role of finance in environmental innovation diffusion an evolutionary modeling approach abstract the implementation of climate adaptation and mitigation policies depend on the development of green technologies whose diffusion is constrained by a number of barriers which prevent them to spread broadly and at a fast pace by means of an agent based computational model the paper investigates the macro and micro economic dynamics considering the role of a traditional commercial bank and a state investment bank that explicitly supports green investments simulation results emphasize that green finance matter and that the market diffusion of environmental innovation is more pronounced when the presence of the public investment bank is combined with strong consumers preferences oriented towards environmental quality the relevance of the paper is twofold besides contributing to the literature on the finance innovation nexus by considering the role of climate finance within a complex systems framework it provides a model that can be used as a tool to explore policies to foster environmental innovation diffusion

efficient dynamic pollution taxation in an uncertain environment this paper analyzes efficient pollution taxation within a stochastic model of endogenous growth pollution is a by product of production and causes disutility furthermore the productivity which results from environmental quality is uncertain this reflects e g uncertain capital depreciation induced by natural disasters like hurricanes or floods this uncertainty is shown to raise an ambiguous impact on the optimal pollution level as well as on optimal environmental taxation market equilibrium turns out to be suboptimal since the households mis perceive their individual impact on pollution conditions for welfare maximizing pollution taxation are stated and it is shown that a direct pollution tax is not appropriate to yield pareto optimal growth instead a linear capital income tax together with a linear abatement subsidy build an efficient tax scheme if secondarily the governmental budget is balanced moreover an increase in the riskiness of environmental productivity may even lead to an increase in the optimal pollution level and to a decrease in optimal environmental taxation depending predominantly on the preference parameters

does precommitment raise growth the dynamics of growth and fiscal policy we develop an endogenous growth model driven by externalities from both private and public capital the government levies distortionary taxation to finance a publicly provided consumption good and public infrastructure firms face adjustment costs we compare the optimal and time consistent policies in a linear quadratic approximation of the model although the timeconsistent equilibrium is sub optimal in terms of ex ante intertemporal welfare it yields higher long run growth and welfare through an accumulation of assets by the state and a cut in government consumption

scale congestion and growth this paper explores the relationship between aggregate and relative congestion returns to scale and economic growth aggregate congestion reduces the effective productivity of capital relative congestion reduces the effective productivity of labour both forms of congestion adversely affect the equilibrium growth rate although their relative effects depend upon aggre gate returns to scale the two forms of congestion have contrasting effects on the transitional dynamics relative congestion retards the rate of adjustment aggregate congestion accelerates it the externalities generated by congestion and non optimal expenditure can be fully cor rected both during the transition and in steady state by a time invariant income tax the role of public expenditure as an instrument of economic growth has been a major policy issue as governments throughout the world design stimulus packages as in japan and face difficult choices to meet the emu criteria in europe empirical research investigating the impact of public investment on the productivity of private capital and output was stimulated by aschauer 1989a b who found the effects to be strongly positive the nature of public investment is however diverse in general public goods vary extensively in terms of the nature of their services spanning the range between the polar cases of pure private and pure public goods but the treatment of public expenditures in formal growth models is limited barro 1990 and futagami et al 1993 treat government expenditure as a pure pub lic good and in so doing they fail to take account of the congestion typically associated with public goods however as barro and sala i martin 1992 have argued almost all public services are characterized by some degree of congestion so that the pure public good should be viewed as only a bench mark these considerations suggest that congestion is an important consider ation in assessing the effect of public expenditures on economic growth attempts to analyse the effects of congestion on economic growth have been limited in various dimensions drawing on the public goods literature edwards 1990 proposes a number of specifications of congestion two notions particularly relevant in a growth context are relative congestion and aggregate absolute congestion the former specifies the level of services derived by an individual from the provision of a public good in terms of the usage of his individual capital stock relative to the aggregate capital stock aggregate congestion sometimes called crowding indicates how aggregate usage of the service alone influences the services received by an individual 2 existing applications of congestion to growth theory introduce it into ak models see barro and sala i martin 1992 1995 glomm and ravikumar 1994 1997 and turnovsky 1996 1997 however the ak model features two limitations that restrict its flexibility to examine the relationship between congestion and growth first as solow 1994 pointed out sustained ongoing

international evidence on the historical properties of business cycles we contrast properties of real quantities with those of price levels and stocks of money for ten countries over the last century although the magnitude of output fluctuations has varied across countries and periods relations among real quantities have been remarkably uniform properties of price levels however exhibit striking differences between periods inflation rates are more persistent after world war ii than before and price level fluctuations are typically procyclical before world war ii and countercyclical afterward fluctuations in money are less highly correlated with output in the postwar period but are no more persistent than in earlier periods jel e32 e31

productive government expenditures and long run growth the purpose of this paper is to review some of the recent developments in endogenous growth models specifically our focus is on the growth effects of productive government spending in dynamic general equilibrium models we use a simple overlapping generations model as our basic framework and illustrate the role of taxes and spending we then examine several related issues nonrivalry in publicly provided goods existence and uniqueness of competitive equilibrium endogenous public policy ways of financing public expenditures composition of publicly provided goods and services and private alternatives finally we review some empirical results related to output elasticity of public capital and educational expenditures

getting help from abroad the macroeconomics of foreign direct investment in infrastructure in low income countries infrastructure financing needs in most low income countries are substantial but funding for such needs is only partly covered by national governments and aid donors this paper introduces foreign direct investment fdi through public private partnerships as a source of infrastructure financing in low income countries a two sector open economy model is developed to assess the macroeconomic performance of fdi in infrastructure with efficient foreign investment an increase in revenue generating infrastructure investment boosts productivity and spurs private investment while stabilizing domestic prices a direct comparison between infrastructure financed by domestic versus foreign investment shows that foreign investment creates higher output growth and welfare gains and is preferable to domestically sourced investment irrespective of the underlying financing instrument the domestic economy is employing fdi in non revenue generating infrastructure is also analyzed and discussed

income taxes public investment and welfare in a growing economy abstract in a growth model with public capital and a spillover externality from private capital we find that income taxes as part of an optimal fiscal policy is a more common result than usually thought the commitment to finance an exogenous component of public expenditures in the form of an exogenous fraction of output may lead to the optimality of positive income taxes this result is robust to alternative assumptions on depreciation rates and preferences we show that welfare losses from deviations from the optimal policy are always smaller when compensated with changes in income taxes than when adjusting lump sum taxes

on the dynamics of growth and fiscal policy with redistributive transfers abstract this paper continues the study of optimal fiscal policy in a growing economy by studying the case in which the government simultaneously provides three main categories of expenditures public production services public consumption services and state contingent redistributive transfers we make two contributions to the literature firstly we set up a dynamic general equilibrium model of endogenous growth in which rational voters choose the capital tax rate and the allocation of total tax revenues between productive government expenditures public production services and non productive ones public consumption services and redistributive transfers we study the properties of these policies and their impact on growth secondly we deliver analytic results for the long run and transitional dynamics of optimal fiscal policies and endogenous growth in particular we establish existence and investigate the possibility of uniqueness and dynamic determinacy and how this possibility is affected by the chosen allocative and redistributive policies

spectral and persistence properties of cyclical growth abstract this article investigates the cyclical properties of an endogenous growth model an explicit solution is derived which permits the full characterization of the cyclical as well as the long run properties of the model using spectral autocorrelation and impulse response functions we show that introducing endogenous growth overcomes some of the main shortcomings of rbc models in particular the model can generate positive autocorrelation of output growth when endogenous growth dominates the dynamics moreover the model exhibits the hump shaped pattern of impulse response functions of the trend reverting component of output

public investment in infrastructure in a simple growth model abstract in this paper we examine the implications for capital accumulation when infrastructure enters as an external input into private production functions in our model infrastructure is nonexclusive but may exhibit varying degrees of nonrivalry revenues from uniform taxes on capital and labor income are used to finance public investment in infrastructure we show that the optimal tax rate is independent of the degree of nonrivalry when production exhibits constant returns to augmentable factors the equilibrium displays constant growth for most parameters the growth rate depends on the population size under decreasing returns the optimal trajectory exhibits monotonic convergence to a steady state level

are oil shocks inflationary asymmetric and nonlinear specifications versus changes in regime this paper identifies a structural break in core u s inflation phillips curves such that oil prices contributed substantially before 1981 but since that time pass through has been negligible this characterization is robust to a variety of re specifications and fits the data better than asymmetric and nonlinear oil price alternatives evidence does not support the hypotheses that declining energy intensity or deregulation of energy producing and consuming industries played an important role monetary policy did not itself become less accommodative of oil shocks but may have helped create a regime where inflation is less sensitive to price shocks more generally

public capital and total factor productivity new evidence from the italian regions 1970 98 destefanis s and sena v 2005 public capital and total factor productivity new evidence from the italian regions 1970 98 regional studies 39 603 618 this paper analyses the relationship between industrial total factor productivity and public capital across the 20 italian administrative regions it adds upon the existing literature in a number of ways it analyses a longer period 1970 98 it allows for the role of human capital accumulation it tests for the existence of a long run relationship between total factor productivity and public capital through previously suggested panel techniques and for weak exogeneity of public capital and it assesses the significance of public capital within a non parametric set up based on the free disposal hull the results confirm that public capital has a significant impact on the evolution of total factor productivity particularly in the southern regions this impact is mainly ascribed to the core infrastructures road and airports harbours railroads w

can exchange rates forecast commodity prices we show that commodity currency exchange rates have surprisingly robust power in predicting global commodity prices both in sample and out of sample and against a variety of alternative benchmarks this result is of particular interest to policy makers given the lack of deep forward markets in many individual commodities and broad aggregate commodity indices in particular we also explore the reverse relationship commodity prices forecasting exchange rates but find it to be notably less robust we offer a theoretical resolution based on the fact that exchange rates are strongly forward looking whereas commodity price fluctuations are typically more sensitive to short term demand imbalances

detrending stylized facts and the business cycle the stylized facts of macroeconomic time series can be presented by fitting structural time series models within this framework we analyse the consequences of the widely used detrending technique popularised by hodrick and prescott 1980 it is shown that mechanical detrending based on the hodrick prescott filter can lead investigators to report spurious cyclical behaviour and this point is illustrated with empirical examples structural time series models also allow investigators to deal explicitly with seasonal and irregular movements that may distort estimated cyclical components finally the structural framework provides a basis for exposing the limitations of arima methodology and models based on a deterministic trend with a single break

public schooling college subsidies and growth abstract how does the mix of public education expenditures across primary and secondary k 12 education and post secondary college education influence economic growth to address this i build an overlapping generations endogenous growth model human capital is accumulated through compulsory k 12 education and through optional college education government uses tax revenue to provide quality in k 12 schooling and to subsidize college tuition when total expenditures are small all funds should provide k 12 quality when expenditures are above a critical value a positive share should subsidize tuition the share should increase with total expenditures and with the degree of complementarity of human capital accumulated through the two types of education also increased education spending is more likely to increase growth when a larger share subsidizes tuition

growth welfare and the size of government i introduction given the current state of political debate within the u s it would appear that making the claim a smaller government is a better government is just a mere statement of a simple fact president clinton the head of the political party which has traditionally supported a larger government has now proclaimed that the era of big government is over and has proposed fiscal programs to cut both taxes and the growth of government spending in a very real sense it has been economists who have been consensus makers on this issue numerous studies have been conducted recently estimating the growth and welfare costs of distortionary taxation 1 these studies have generally found that income and capital taxation have large welfare effects and also significant effects on growth however the potential benefits of the government purchases financed with distortionary taxes are very limited in these supply side models most often being simply ignored in these aforementioned studies government purchases do not directly provide utility to households and do not affect the productivity of firms as a result the optimal size of government in these models is zero which is a troubling property of any model being used to evaluate the effects of changes in fiscal policy in terms of cost benefit analysis by ignoring these effects previous studies have only considered the costs of a larger government but not the benefits 2 this paper develops an endogenous growth model of the u s economy in which government purchases directly affect both the utility of individuals through the provision of public consumption goods and services and the productivity of firms through the provision of public capital in a manner which is consistent with existing empirical work by aschauer 1985 1989 and munnell 1990a b among others by incorporating the full benefits of government purchases into our model the growth and welfare effects of a smaller government can be more realistically evaluated this paper proceeds as follows in section ii the endogenous growth model with human capital accumulation used in this study is described the competitive equilibrium of the model is described and calculated in section iii and the calibration of the parameters in the model is discussed in section iv in section v various fiscal policy experiments are conducted investigating the growth and welfare effects of government downsizing although this is a macroeconomic model and as such is too general to investigate the effects of specific government spending and taxation programs the results presented here do provide some broad fiscal policy guidelines 1 the effects of a smaller government depend as much on the mix of spending cuts as on the mix of tax cuts and government downsizing is not necessarily growth and welfare enhancing 2 while tax reductions by themselves can significantly increase growth and welfare simultaneous reductions in government spending and taxation are not likely to lead to large positive or negative changes in growth or welfare regardless of the exact form of the spending and tax cuts 3 reducing the size of government is less likely to increase growth and welfare if the reductions in public investment are large especially reductions in public investment which directly affect the accumulation of human capital 4 government downsizing is most likely to increase growth and welfare if the proceeds from spending cuts are used to finance reductions in capital tax rates 5 across the board spending cuts fail to maximize the potential growth and welfare benefits of government downsizing although downsizing is more likely to increase growth and welfare if the cuts pertain to all forms of government spending including transfer payments and not just government purchases ii description of the model the model developed here is similar to the well known two sector endogenous growth model used by rebelo 1991 and king and rebelo 1990 with endogenous labor supply

growth convergence and public investment a bayesian model averaging approach the aim of this study is twofold first the determinants of economic growth are studied among a wide set of potential variables for the spanish provinces nuts3 among others various types of private public and human capital in the group of growth factors are included also it is analysed whether spanish provinces have converged in economic terms in recent decades the second objective is to obtain cross section and panel data parameter estimates that are robust to model specification for this purpose a bayesian model averaging bma approach is used bayesian methodology constructs parameter estimates as a weighted average of linear regression estimates for every possible combination of included variables the weight of each regression estimate is given by the posterior probability of each model

productivity growth and the structure of the business cycle abstract over the recent years opportunity cost oc models of growth have argued that recessions are times when firms engage in productivity improving activities because of intertemporal substitu tion this paper tests whether this approach is correct the technique used to disentangle the trend from the cycle is semi structural vector autoregression the results are mildly supportive of the oc theory there tends to be a negative impact of demand shocks on productivity both in the short run and in the long run and the short run impact is stronger in those countries where fluctuations are more transitory however there is no significant response of r d to demand shocks

should central banks respond to movements in asset prices in recent decades asset booms and busts have been important factors in macroeconomic fluctuations in both industrial and developing countries in light of this experience how if at all should central bankers respond to asset price volatility we have addressed this issue in previous work bernanke and gertler 1999 the context of our earlier study was the relatively new but increasingly popular monetary policy framework known as inflation targeting see e g bernanke and frederic mishkin 1997 in an inflation targeting framework publicly announced medium term inflation targets provide a nominal anchor for monetary policy while allowing the central bank some flexibility to help stabilize the real economy in the short run the inflation targeting approach gives a specific answer to the question of how central bankers should respond to asset prices changes in asset prices should affect monetary policy only to the extent that they affect the central bank s forecast of inflation to a first approximation once the predictive content of asset prices for inflation has been accounted for there should be no additional response of monetary policy to assetprice fluctuations in use now for about a decade inflationtargeting has generally performed well in practice however so far this approach has not often been stress tested by large swings in asset prices our earlier research employed simulations of a small calibrated macroeconomic model to examine how an inflation targeting policy defined as one in which the central bank s instrument interest rate responds primarily to changes in expected inflation might fare in the face of a boom and bust cycle in asset prices we found that an aggressive inflationtargeting policy rule in our simulations one in which the coefficient relating the instrument interest rate to expected inflation is 2 0 substantially stabilizes both output and inflation in scenarios in which a bubble in stock prices develops and then collapses as well as in scenarios in which technology shocks drive stock prices intuitively inflation targeting central banks automatically accommodate productivity gains that lift stock prices while offsetting purely speculative increases or decreases in stock values whose primary effects are through aggregate demand conditional on a strong policy response to expected inflation we found little if any additional gains from allowing an independent response of central bank policy to the level of asset prices in our view there are good reasons outside of our formal model to worry about attempts by central banks to influence asset prices including the fact that as history has shown the effects of such attempts on market psychology are dangerously unpredictable hence we concluded that inflationtargeting central banks need not respond to asset prices except insofar as they affect the inflation forecast in the spirit of recent work on robust control the exercises in our earlier paper analyzed the performance of policy rules in worst case discussants robert shiller yale university glenn rudebusch federal reserve bank of san francisco kenneth rogoff harvard university

implementation cycles investment and growth we develop a model of intrinsic cycles driven by the decentralized behavior of entrepreneurs and firms making continuous divisible improvements in their productivity we show that when the introduction of productivity improvements is endogenous implementation cycles arise even in the presence of reversible investment and consumption smoothing the implied cyclical equilibrium is unique within its class and shares several features in common with actual business cycles in particular its predictions are qualitatively consistent with the joint behavior of the investment rate and tobin s q during u s recessions

macroeconomic conditions and the determinants of commercialisation in this paper we focus on the effects of macroeconomic conditions on commercialisation using survey data on the activities of australian inventors who attempted to commercialise 3 736 inventions over the period 1986 2005 we find evidence that macroeconomic conditions have a pro cyclical effect on commercialisation activities such a finding has important policy implications since it suggests that recessions have both short term effects on employment income and long term effects on productivity however the magnitude of the supply side effects the cost of finance and level of public sector research are estimated to be larger than the growth in aggregate or industry demand copyright the author 2010 published by oxford university press on behalf of the cambridge political economy society all rights reserved oxford university press

agricultural productivity and economic growth role of tax revenues and infrastructures 1 introductiondevelopment economists such as rostow 1960 and ranis and fei 1961 have stressed a positive linkage between agricultural productivity and industrialization the positive link however has been argued to be nonexistent by matsuyama 1992 in a two sector endogenous growth model of small open economies with a low elasticity of agricultural goods and the existence of learning by doing only in the domestic manufacturing sector 1 as a result of comparative advantage higher agricultural productivity solicits labor inputs from the manufacturing sector in his model leading to lower learning by doing and economic growth matsuyama s results however may not be consistent with what has actually happened in japan and other east asian economies in japan a land reform has been implemented and allocation of resources to agricultural research has been increased since the meiji restoration as a result of agricultural technical progress 2 agricultural productivity in japan is much higher than before the meiji restoration in particular evidence has shown that the agricultural technical change after the meiji restoration tends to increase nonagricultural output by pushing resources out of the agricultural sector into the nonagricultural sector for example see yamaguchi and binswanger 1975 table 7 for the quantitative effects of the agricultural technical change in japan on nonagricultural output column 3 and on input reallocation columns 5 and 7 in 1880 1965 similarly the agricultural technical change was higher in korea s and taiwan s early stages of economic development as they have founded agricultural research institutes and farmers associations during the japanese colonial period3 and implemented land reforms after world war ii for evidence see mason et al 1980 chapter 7 for the case of korea and thorbecke 1979 for the case of taiwan a world bank 1982 p 45 study reports that for the 23 developing countries whose agricultural growth rate in the 1970s exceeded 3 a year 17 countries had a gdp growth rate above 5 a year in the same period finally using cross country data for 14 asian developing countries in 1960 1986 mellor 1995 finds a positive and significant relationship between growth rate of per capita agricultural and nonagricultural gdps in which both agricultural and nonagricultural sectors grow more rapidly than 31 sub saharan and 20 latin american countries these above observations lead to interesting questions as to what mechanism lies in the positive impact of accelerated agricultural growth on nonagricultural growth what policies might increase the efficiency with which a productive agricultural sector moves a nonagricultural sector forward the purpose of this study is to revisit the linkages between agricultural productivity and economic growth with a government policy our model is based on matsuyama s 1992 framework with a small twist so that we can clearly identify the mechanism leading to a positive relationship the departure in this article lies in introducing a government which collects taxes and then conducts expenditures on infrastructures an important role played by higher agricultural productivity in an early stage of economic development is the one by which it renders the government larger tax revenues so that larger expenditure on infrastructures is facilitated 4 in a study investigating taiwan s rice for fertilizer bartering system in the 1950s and 1960s koo 1996 table 2 finds that the resulting hidden taxes on rice alone account for 10 20 of total tax revenue in the period extending from 1950 to 1969 along with other taxes the agricultural sector is thus an important source of government revenue in a developing economy 5 following barro 1991 public expenditure on infrastructures is assumed to be productive in that the learning by doing effect of the manufacturing sector becomes enhanced with public expenditure on infrastructures

growing through cycles the neoclassical growth model focuses on factor accumulation as an engine of growth while the neo schumpetarian growth model stresses innovation this paper argues that these two views of growth may capture different phases of a single growth experience in the model presented below the balanced growth path is unstable and the economy achieves sustainable growth through cycles under an empirically plausible condition perpetually moving back and forth between two phases one phase is characterized by higher output growth higher investment no innovation and a competitive market structure the other phase is characterized by lower output growth lower investment high innovation and a more monopolistic market structure both investment and innovation are essential in sustaining growth indefinitely and yet they move in an asynchronized way only one of them appears to play a dominant role in each phase the economy grows faster along the cycles than along the unstable balanced growth path

volatility and growth credit constraints and the composition of investment abstract how does uncertainty and credit constraints affect the cyclical composition of investment and thereby volatility and growth this paper addresses this question within a model where firms engage in two types of investment a short term one and a long term one which contributes more to productivity growth because it takes longer to complete long term investment has a relatively less cyclical return but it also has a higher liquidity risk the first effect ensures that the share of long term investment to total investment is countercyclical when financial markets are perfect the second implies that this share may turn procyclical when firms face tight credit constraints a novel propagation mechanism thus emerges through its effect on the cyclical composition of investment tighter credit can lead to both higher volatility and lower mean growth evidence from a panel of countries provides support for the model s key predictions

infrastructure provision and macroeconomic performance this paper studies the differences between private and government provision of infrastructure capital utilization decisions and their differential role in determining market prices for capital goods under the two regimes of infrastructure provision serve as a critical transmission mechanism for fiscal policy a subsidy to private providers of infrastructure is preferable to direct government provision irrespective of how the subsidy or expenditure is financed the case for private provision is much stronger in economies characterized by high levels of congestion the choice between private and government provision also has a crucial effect on the design of optimal fiscal policy 2011 elsevier b v all rights reserved

public investment congestion and private capital accumulation this paper analyses the impact of public investment on the dynamics of private capital formation in an intertemporal optimising market clearing framework the key feature characterising the analysis is that the public good is treated as a durable capital good subject to congestion we show how in the presence of congestion the effect of government investment on private capital formation involves a tradeoff between the degree of substitution between private and public capital in production and the degree of congestion both lump sum and distortionary tax financing are considered with this tradeoff being tightened in the latter case

corrigendum to congestible public goods and local indeterminacy a two sector endogenous growth model journal of economic dynamics control 31 7 2007 2486 2518

faraway so close coupled climate and economic dynamics in an agent based integrated assessment model abstract in this work we develop an agent based model that offers an alternative to standard computable general equilibrium integrated assessment models iams the dystopian schumpeter meeting keynes dsk model is composed of heterogeneous firms belonging to capital good consumption good and energy sectors production and energy generation lead to greenhouse gas emissions which affect temperature dynamics climate damages are modelled at the individual level as stochastic shocks hitting workers labour productivity energy efficiency capital stock and inventories of firms in that aggregate damages emerge from the aggregation of losses suffered by heterogeneous interacting and boundedly rational agents the model is run focusing on a business as usual carbon intensive scenario consistent with a representative concentration pathway 8 5 we find that the dsk model is able to account for a wide ensemble of micro and macro empirical regularities concerning both economic and climate dynamics simulation experiments show a substantial lack of isomorphism between the effects of micro and macro level shocks as it is typical in complex system models in particular different types of shocks have heterogeneous impact on output growth unemployment rate and the likelihood of economic crises pointing to the importance of the different economic channel affected by the shock overall we report much larger climate damages than those projected by standard iams under comparable scenarios suggesting possible shifts in the growth dynamics from a self sustained pattern to stagnation and high volatility and the need of urgent policy interventions

optimal fiscal policy public capital and the productivity slowdown abstract this paper develops a quantitative theoretical model for the optimal provision of public capital we show that the ratio of public to private capital in the us economy since 1925 evolves in a manner that is broadly consistent with an optimal transition path derived from a simple growth model the model is used to quantify the conditions under which an increase in the stock of public capital is desirable and to investigate the degree to which nonoptimal fiscal policies can account for the us productivity slowdown

using an error correction model to test whether endogenous long run growth exists abstract a major empirical interest in growth studies is whether permanent changes in economic fundamentals affect the long run growth rate or not however a direct time series analysis of this hypothesis may not always be feasible because the permanence of many such changes is rather questionable this paper explains why examining the long run effects of temporary changes in investment share on per capita output provides indirectly the answer regarding the effects of possibly hypothetical permanent changes in investment share when log per capita output and log per capita investment are cointegrated applying the proposed method to the post war data of major industrial countries it is found that a disturbance to investment share does not produce a positive long run effect in each of the three countries france japan and the united kingdom in which log per capita output and log per capita investment are cointegrated the evidence is unfavorable to the class of endogenous growth models

excludable and non excludable public inputs consequences for economic growth non excludable and excludable public inputs are introduced into an endogenous growth model we derive the equilibrium growth rate and design the optimal tax and user cost structure emphasizing the role of congestion and its consequences for the government s budget the latter comprises fee and tax revenues that are used to finance the public inputs although they may generate insufficient revenue to do so entirely we extend the model to allow for monopoly pricing of the user fee by the government most of the analysis is conducted for general production functions consistent with endogenous growth but the ces technology is also considered a vast literature has evolved emphasizing the role of public investment as a determinant of economic growth among the earliest contributions arrow and kurz 1970 is particularly significant while the seminal work of barro 1990 has been especially influential with respect to the contemporary endogenous growth literature stimulated by aschauer s 1989 findings pertaining to the high rate of return on public capital several authors have explored various aspects of the role of public capital in stimulating economic growth for example baxter and king 1993 and fisher and turnovsky 1998 examine the interaction between public and private capital in a ramsey type growth model while futagami et al 1993 perform a similar type of analysis in an endogenous growth context glomm and ravikumar 1997 analyse the growth effects of productive public spending in an overlapping generations setup extending the framework to include majority voting and alternative compositions of publicly provided goods and services they also indicate private alternatives to public provision but do not pursue this in detail cassou and lansing 1998 focus on the relationship between private and public capital showing how the evolution of the ratio between the two in the us economy since 1925 is broadly consistent with the predictions of a simple ramsey growth model they also show how the productivity slowdown in the us economy since the 1970s is more likely due to increasing tax rates than to non optimal public investment policy much of the literature including barro treats the public input as a pure public good freely available without restrictions or impediments to all agents in the economy but the public goods literature identifies many different characteristics that most public goods in fact exhibit notably the presence of rivalry and or excludability see e g cornes and sandler 1996 thus the treatment of a public

congestible public goods and local indeterminacy a two sector endogenous growth model abstract this paper shows that the congestible public goods can generate local indeterminacy in a two sector constant return human capital enhanced growth model while the productive public good exerts positive sector specific externalities the congestion effect generates negative aggregate externalities the sector specific externalities alone arising from productive public goods cannot establish local indeterminacy without the combination of negative externality in a model with social constant return technology congestible public good generates local indeterminacy if the degree of productive public good externality and the degree of congestion effect are large enough the condition for indeterminacy is independent of the factor intensity rankings the conditions are quantitatively assessed and the required parameter values for the degrees of public good externality and congestion are consistent with the estimated values in existing literature

government science and technology budgets in times of crisis abstract following a recent paper by filippetti and archibugi filippetti a archibugi d 2011 innovation in times of crisis national systems of innovation structure and demand research policy 40 2 179 192 this article aims to contribute to the sparse literature on the impacts of the recent economic downturn on the government expenditures and innovative activities of the countries of the enlarged european union eu 27 using eurostat s socio economic objectives i e the nomenclature for the analysis and comparison of scientific programmes and budgets nabs 2007 classification this paper addresses the impact of the recent economic downturn on governments science and technology s t budgets across the 27 eu countries most countries followed a pro cyclical pattern where the government s t budgets in most nabs shrunk along slowing gross domestic product growth in similar pace with total government expenditure the new member states of eastern europe were the most affected

is public expenditure productive abstract this paper considers the relationship between aggregate productivity and stock and flow government spending variables the empirical results indicate that i the nonmilitary public capital stock is dramatically more important in determining productivity than is either the flow of nonmilitary or military spending ii military capital bears little relation to productivity and iii a core infrastructure of streets highways airports mass transit sewers water systems etc has most explanatory power for productivity the paper also suggests an important role for the net public capital stock in the productivity slowdown of the last fifteen years

the dynamic causality between commodity prices inflation and output in china a bootstrap rolling window approach in this article we empirically study the time varying bilateral causality between commodity prices inflation and output in china we first perform a series of parameter stability tests and find s

measuring core inflation in this paper we argue that measured rpi inflation is conceptually mismatched with core inflation the difference is more than just measurement error we propose a technique for measuring core inflation based on an explicit long run economic hypothesis core inflation is defined as that component of measured inflation that has no medium to long run impact on real output a notion that is consistent with the vertical long run phillips curve interpretation of the co movement in inflation and output we construct a measure of core inflation by placing dynamic restrictions on a vector autoregression var system

the accumulation of wealth and the cyclical generation of new technologies a search theoretic approach in this paper sustained technological progress results from the feedback between technical change and the accumulation of wealth the production technology is affected by a productivity factor which ensues from research and development the research and development process is described as a sequential search problem in which optimal decisions depend on current levels of wealth and technology the resulting growth path displays invention cycles a discovery of a significant technological improvement at the end of a search phase is followed by periods of growth without search eventually sufficient wealth is accumulated research and development resumes and a new cycle begins copyright 1996 by economics department of the university of pennsylvania and the osaka university institute of social and economic research association

r d expenditure in g7 countries and the implications for endogenous fluctuations and growth abstract the literature on endogenous growth cycles predicts countercyclical r d expenditure aggregate r d expenditure in g7 countries from 1973 to 2000 tends to be procyclical implications for future theoretical research are discussed

growing through cycles in an infinitely lived agent economy abstract this paper extends the analysis of k matsuyama econometrica67 1999 335 347 to the case of an infinitely lived representative agent economy the economy grows endogenously through endogenous fluctuations perpetually moving back and forth between two phases in one phase there is no innovation the market structure is competitive and the economy grows solely by capital accumulation in the other phase new goods are introduced and the market structure is monopolistic in the long run both investment and innovation grow at the same rate but the economy alternates between the periods of high investment and the periods of higher innovation journal of economic literature classification numbers e32 o11

more international evidence on the historical properties of business cycles this paper establishes stylized facts about business cycles in the late 19th century using spectral analysis techniques which allow an intuitive description and analysis of cyclical structure in economic fluctuations analysis of industrial production data for 13 countries permits the following generalizations in the advanced north atlantic economies a fairly regular long cycle with a periodicity of 7 10 years is identified in all countries this component explains a substantial fraction of overall variation in industrial production there is some evidence of a less regular less powerful short cycle of 3 5 years duration in peripheral economies experience is varied but it is more often the short cycle that exercises greater influence the long cycle component is shown to be highly correlated among the core economies much less so between core and peripheral economies and least of all among peripheral economies the long cycle is more highly correlated among countries with important trading ties and those on a metallic monetary standard throughout the period

reprint to infrastructure provision and macroeconomic performance abstract this paper studies the differences between private and government provision of infrastructure capital utilization decisions and their differential role in determining market prices for capital goods under the two regimes of infrastructure provision serve as a critical transmission mechanism for fiscal policy a subsidy to private providers of infrastructure is preferable to direct government provision irrespective of how the subsidy or expenditure is financed the case for private provision is much stronger in economies characterized by high levels of congestion the choice between private and government provision also has a crucial effect on the design of optimal fiscal policy

optimal saving under poisson uncertainty abstract this paper studies optimal saving and investment behaviour of a household that can either invest in a riskless or a risky saving technology when risk results from a poisson process the focus is on behaviour of households in a general equilibrium setup poisson processes are introduced since they allow us to understand and model endogenous cycles jointly with long run growth it turns out that a very simple intuitive and tractable characterization of equilibrium is possible journal of economic literature classification numbers c61 o33 o41

growth and public debt what are the relevant trade offs the interplay between growth and public debt is addressed considering a barro type 1 endogenous growth model where public spending is financed through taxes on income and public debt debt is assumed to be a fixed proportion of gdp which is used as a policy parameter by the government we first show that when debt is a large enough proportion of gdp two distinct bgps may co exist one being indeterminate therefore local and global indeterminacy may arise and self fulfilling expectations appear as a crucial ingredient to understand the impact of debt on growth and on macroeconomic fluctuations we then exhibit two types of important trade off associated with self fulfilling expectations first we show that the lowest bgp is always decreasing with respect to the ratio of debt gdp while the highest one is increasing as a result depending on the bgp selected by agents expectations the relationship between debt and growth is not always negative second we show that the highest bgp which provides the highest welfare is always locally indeterminate while the lowest is always locally determinate therefore depending on the expectations of agents when debt is increasing large fluctuations associated to self fulfilling believes may occur and be associated at the same time with welfare losses if there is a coordination on the low steady state finally a simple calibration exercise allows to provide an understanding of the recent experiences of many oecd countries

the transitional dynamics of fiscal policy long run capital accumulation and growth this paper analyzes the effects of fiscal policies in a non scale growing economy with public and private capital the equilibrium dynamics are characterized and we contrast the dynamic effects of government expenditure on investment and expenditure on consumption under four alternative modes of tax financing most of our attention focuses on the numerical simulations of a calibrated economy the results emphasize the lengthy transition periods which implies that policies have sizeable level effects leading to substantial welfare effects even though long run growth rates are unaffected the paper highlights the intertemporal dimensions of fiscal policy and the tradeoffs these involve for economic performance especially growth and welfare

endogenous growth cycles current explanations why a growing economy necessarily goes through periods of high and low growth predict countercyclical r d investment as this is very controversial from an empirical perspective a stochastic poisson model of endogenous growth cycles is presented where the determinants of the cyclical behaviour of r d investment are analytically studied providing an explicit expression for the expected length of a cycle shows that high frequency fluctuations can indeed be understood by this approach it is also shown how small technological improvements translate into large aggregate fluctuations

green attitude and economic growth we analyze the interdependence between green attitude and equilibrium development of environmental quality in an endogenous growth model individuals take only part of their impact on pollution into account hence there is a negative externality of capital accumulation on environmental quality increasing wealth or increasing pollution enhance green attitude and reduce the externality because individuals care more about the environment if their income is higher or if pollution is more obvious the time path of pollution as well as the evolution of equilibrium growth are shown to depend crucially on the determinants of green attitude ongoing growth may lead to complete internalization of the environmental externality if green attitude improves with increasing wealth e g as a consequence of an increase in environmental education in contrast if green attitude is determined exclusively by the level of environmental quality pollution remains at a suboptimally high level the interdependence of wealth and pollution in the determination of environmental awareness implies more complex dynamics capital growth enhances green attitude and thereby decreases pollution improved environmental quality in turn may increase capital growth due to less green attitude and therefore slow down convergence to the sustainable balanced growth path

indeterminacy and fiscal policies in a growing economy this paper studies the dynamic properties of a standard one sector model of endogenous growth with inelastic labor supply in which capital taxes are used to nance public production and consumption services the government is benevolent and chooses its tax policy by taking into account the decentralized competitive equilibrium within this second best setup we establish conditions for multiple balanced growth paths in conjunction with indeterminacy of transitional dynamics the mechanism for global and local indeterminacy is a simple combination of public production services that provide production externalities to private rms and hence cause a wedge between private and social returns public consumption services that provide direct utility to households and endogenously chosen distorting taxes

a simple time series test of endogenous vs exogenous growth models an application to the united states this paper presents evidence supporting endogenous growth models that emphasize public structural capital the authors apply a simple test of endogenous vs exogenous growth models in exogenous growth economies temporary innovations to policy variables lead only to temporary changes in gnp levels while in endogenous growth economies the innovations can lead to permanent changes in gnp levels of the seven u s policy variables they examine only non military equipment capital and non military structural capital have a statistically and economically significant effect upon long run gnp levels further estimation suggests that the non military equipment capital result is not robust and that several disaggregate components of structural capital contribute significantly copyright 1996 by mit press

the economic determinants of technology shocks in a real business cycle model abstract creative destruction due to new technologies causes both long run growth and short run business fluctuations new technologies push the economy on a higher productivity level but also imply partial obsolescence of old production units obsolescence induces an adjustment period during which growth rates gradually fall at some endogenously determined point research for the next technology starts once the new technology is discovered a technology shock occurs and the next cycle starts this is shown in a continuous time rbc model with risk averse agents where savings can be used for financing deterministic capital accumulation and stochastic r d for new technologies

public capital maintenance and congestion long run growth and fiscal policies abstract in this paper we study an endogenous growth model in which public maintenance expenditures affect the depreciation rate of public capital and the latter is subject to congestion we find that economies with low congestion in public infrastructure will require a threshold level of public capital maintenance for ongoing growth we also examine the fiscal implications of public capital maintenance policies and we find that the composition of public capital expenditures under congestion is a crucial determinant of optimal and growth maximizing fiscal policies the government can affect the return of public capital by re allocating public expenditures between new public investment and maintenance and hence avoid excessive taxation that is required under increasing congestion

optimal public debt redux abstract we examine the role played by government investment in infrastructure in determining the optimal quantity of public debt in a heterogeneous agent economy with incomplete insurance markets calibrating our model to the key aggregate and distributional moments of the u s economy for the period 1990 2015 we show that i the inclusion of infrastructure and ii transitional dynamics between stationary states critically affect the characterization of the optimal level of public debt our results indicate that the inclusion of public infrastructure in the model specification implies a lower optimal debt level relative to the specification without infrastructure both when comparing stationary equilibria and when accounting for transitional dynamics when welfare comparisons are made by comparing stationary equilibria we find that it is optimal for the government to accumulate assets public surplus however once transitional dynamics are accounted for accumulating debt becomes optimal with the optimal share implied by our model being significantly higher than the average public debt gdp ratio for the u s observed during our sample period

on the cyclicality of r d this paper explores the link between short run cycles and long run growth by examining the cyclicality of rd but aggregate data repeatedly show that rd but interestingly estimates using demand shift instruments suggest that it responds asymmetrically to demand shocks we propose that liquidity constraints and technology improvement cause the observed pro cyclicality of r d

distortionary taxes and public investment when government promises are not enforceable abstract we characterize the optimal financing of productive public capital and compute the welfare loss from being unable to commit to the ramsey policy because this calculation ultimately relies on numerical approximations we contrast alternative approaches while perturbation and linear quadratic methods deliver accurate steady states the latter can yield misleading policy implications during transitions we find that moving from a regime with commitment to one with discretion implies only a small welfare loss although markov perfect consumption falls noticeably short of its ramsey counterpart in steady state consumption under discretion is higher in the short run which largely offsets this long run loss

animal spirits through creative destruction we show how a schumpeterian process of creative destruction can induce rational herd behavior by entrepreneurs across diverse sectors as if fueled by animal spirits consequently a multisector economy in which productivity improvements are made by independent profit seeking entrepreneurs exhibits regular booms slowdowns and downturns as part of the long run growth process our cyclical equilibrium has higher average growth but lower welfare than the corresponding acyclical one we show how a negative relationship can emerge between volatility and growth across cycling economies and assess the extent to which our model matches several features of actual business cycles

teaching dsge models to undergraduates abstract this paper puts forward a systematic approach to teaching simple dynamic stochastic general equilibrium dsge models to undergraduates it proceeds in the following way first the structural model of the economy which includes the households and firms problems is presented and progressively solved we then find the steady state and log linearized equations of the model next a productivity shock is simulated on the computer so as to tell a story about how the economy behaves finally the model is extended by including the government and the foreign sector we reckon instructors of macroeconomics will find this path useful in teaching their undergraduate students the basics of dsge models

oil shocks and aggregate macroeconomic behavior the role of monetary policy a recent paper by bernanke gertler and watson 1997 suggests that monetary policy could be used to eliminate any recessionary consequences of an oil price shock this paper challenges this conclusion on two grounds first we question whether the federal reserve actually has the power to implement such a policy for example we consider it unlikely that additional money creation would have succeeded in reducing the fed funds rate by 900 basis points relative to the values seen in 1974 second we point out that the size of the effect that bernanke gertler and watson attribute to oil shocks is substantially smaller than that reported by other researchers primarily due to their choice of a shorter lag length than that used by other researchers we offer evidence in favor of the longer lag length employed by previous research and show that under this specification even the aggressive federal reserve policies proposed would not have succeeded in averting a downturn