bond market exposures to macroeconomic and monetary policy risks i provide empirical evidence of changes in the u s treasury yield curve and related macroeconomic factors and investigate whether the changes are brought about by external shocks monetary policy or by both to explore this i characterize bond market exposures to macroeconomic and monetary policy risks using an equilibrium term structure model with recursive preferences in which inflation dynamics are endogenously determined in my model the key risks that affect bond market prices are changes in the correlation between growth and inflation and changes in the conduct of monetary policy using a novel estimation technique i find that the changes in monetary policy affect the level of bond yields through their effect on expected inflation while the changes in the correlation between growth and inflation affect both the level as well as the volatility of bond yields consequently the changes in the correlation structure are the main contributor to bond risk premia and to bond market volatility the time variations within a regime and risks associated with moving across regimes lead to the failure of the expectations hypothesis and to the excess bond return predictability regression of cochrane and piazzesi 2005 as in the data

public health spending old age productivity and economic growth chaotic cycles under perfect foresight abstract this paper analyses the dynamics of a double cobb douglas economy with overlapping generations and public health investments that affect the supply of efficient labour of the old aged it is shown that the positive steady state of the economy is unique moreover we provide necessary and sufficient conditions for the emergence of endogenous deterministic complex cycles when individuals are perfectly foresighted interestingly i the equilibrium dynamics shows rather complicated phenomena such as a multiplicity of bubblings depending on the size of the public health system and ii the higher the degree of thriftiness the likelier an economy is exposed to endogenous fluctuations because the need to save when young to support consumption when old is reduced

a characterization of erratic dynamics in the overlapping generations model abstract in this paper we characterize and give examples o wide classes of utility functions which generate erratic dynamics in the standard deterministic overlapping generations model erratic dynamics refers to feasible trajectories which are bounded but which do not converge to stationary points or periodic orbits we show that such trajectories are pareto efficient we introduce credit into the model and show how a constant credit expansion rate can result in erratic trajectories in prices and the real value of credit finally we briefly discuss certain technical aspects of the mathematics used and the statistical nature of the dynamics that can arise from deterministic dynamical systems

determinacy and identification with taylor rules the new keynesian taylor rule theory of inflation determination relies on explosive dynamics by raising interest rates in response to inflation the fed induces ever larger inflation unless inflation jumps to one particular value on each date however economics does not rule out explosive inflation so inflation remains indeterminate attempts to fix this problem assume that the government will choose to blow up the economy if alternative equilibria emerge by following policies we usually consider impossible the taylor rule is not identified without unrealistic assumptions thus taylor rule regressions do not show that the fed moved from passive to active policy in 1980

monetary policy shifts and the term structure we estimate the effect of shifts in monetary policy using the term structure of interest rates in our no arbitrage model the short rate follows a version of the taylor s 1993 discretion versus policy rules in practice carnegie rochester conference series on public policy 39 195 214 rule where the coefficients on the output gap and inflation vary over time the monetary policy loading on the output gap has averaged around 0 4 and has not changed very much over time the overall response of the yield curve to output gap components is relatively small in contrast the inflation loading has changed substantially over the last 50 years and ranges from close to zero in 2003 to a high of 2 4 in 1983 long term bonds are sensitive to inflation policy shifts with increases in inflation loadings leading to higher short rates and widening yield spreads

macroeconomics and the term structure this paper provides an overview of the analysis of the term structure of interest rates with a special emphasis on recent developments at the intersection of macroeconomics and finance the topic is important to investors and also to policymakers who wish to extract macroeconomic expectations from longer term interest rates and take actions to influence those rates the simplest model of the term structure is the expectations hypothesis which posits that long term interest rates are expectations of future aver age short term rates in this paper we show that many features of the configuration of interest rates are puzzling from the perspective of the expectations hypothesis we review models that explain these anomalies using time varying risk premia although the quest for the fundamental macroeconomic explanations of these risk premia is ongoing inflation uncertainty seems to play a large role finally while modern finance theory prices bonds and other assets in a single unified framework we also consider an earlier approach based on segmented markets market segmentation seems important to understand the term structure of interest rates during the recent financial crisis jel e31 e43 e52 e58

testing for indeterminacy an application to u s monetary policy reply this paper considers a prototypical new keynesian model in which the equilibrium is undetermined if monetary policy is passive the likelihood based estimation of dynamic equilibrium models is extended to allow for indeterminacies and sunspot fluctuations we construct posterior weights for the determinacy and indeterminacy region of the parameter space and estimates for the propagation of fundamental and sunspot shocks according to the estimated model u s monetary policy post 1982 is consistent with determinacy whereas the pre volcker policy is not we find that before 1979 indeterminacy substantially altered the propagation of shocks

monetary policy trend inflation and the great moderation an alternative interpretation with positive trend inflation the taylor principle does not guarantee a determinate equilibrium we provide new theoretical results on determinacy in new keynesian models with positive trend inflation and new empirical findings on the federal reserve s reaction function before and after the volcker disinflation to find that i while the fed likely satisfied the taylor principle before volcker the us economy was still subject to self fulfilling fluctuations in the 1970s ii the us economy switched to determinacy during the volcker disinflation and iii the switch reflected changes in the fed s response to macroeconomic variables and the decline in trend inflation jel e12 e23 e31 e32 e52

monetary policy bond risk premia and the economy within an affine model of the term structure of interest rates where bond yields get driven by observable and unobservable macroeconomic factors parameter restrictions help identify the effects of monetary policy and other structural disturbances on output inflation and interest rates and decompose movements in long term rates into terms attributable to changing expected future short rates versus risk premia when estimated the model highlights a broad range of channels through which monetary policy affects risk premia and the economy risk premia affect monetary policy and the economy and the economy affects monetary policy and risk premia

long run risks in the term structure of interest rates estimation summary this paper estimates a model in which persistent fluctuations in expected consumption growth expected inflation and their time varying volatility determine asset price variation the model features epstein zin recursive preferences which determine the market price of macro risk factors analysis of the us nominal term structure data from 1953 to 2006 shows that agents dislike high uncertainty and demand compensation for volatility risks also the time variation of the term premium is driven by the compensation for inflation volatility risk which is distinct from consumption volatility risk the central role of inflation volatility risk in explaining the time varying term premium is consistent with other empirical evidence including survey data in contrast the existing long run risks literature emphasizes consumption volatility risk and ignores inflation specific time varying volatility the estimation results of this paper suggest that inflation specific volatility risk is essential for fitting the time series of the us nominal term structure data copyright 2012 john wiley sons ltd

chaotic dynamics in an overlapping generations model with myopic and adaptive expectations in this paper we study dynamic behavior of an overlapping generations model under three different expectations perfect foresight myopic expectations and adaptive expectations we show that economic transition under myopic or adaptive expectations is very different from that under perfect foresight when agents are perfectly foresighted dynamics is simple with a unique steady state that is globally attracting however cycles and chaotic motion can appear under myopic and adaptive expectations we study the possibility of li yorke chaos under myopic expectations and entropic chaos under adaptive expectations

firm turnover restructuring and labour productivity in transition the case of poland this article explores the impact of turnover and restructuring on labour productivity in the polish economy over the period 1988 to 1993 changes in aggregate productivity are decomposed into elements corresponding to productivity growth among survivors market share growth by survivors and the contributions of entering and exiting firms the traditional entry and exit effects begin to work as transition to a market economy progresses however initial productivity improvements are due to changes in market shares of the existing firms following the break up of large enterprises regression analysis shows that changes in the firm level productivity are affected by restructuring and a more competitive economic environment

bond and stock returns in a simple exchange model this paper studies asset pricing in a general equilibrium representative agent exchange model the assumptions of isoelastic period utility and lognormal endowment allow the derivation of closed form solutions for asset returns without restricting the serial correlation of the log endowment risk premiums on stocks and real bonds are found to be simple functions of relative risk aversion the variance of the log endowment innovation and the weights in the moving average representation of the log endowment the paper analyzes the sign of term premiums the size of the equity premium and the effect of taste shocks on asset prices

on the complexities of complex economic dynamics complex economic nonlinear dynamics endogenously do not converge to a point a limit cycle or an explosion their study developed out of earlier studies of cybernetic catastrophic and chaotic systems complexity analysis stresses interactions among dispersed agents without a global controller tangled hierarchies adaptive learning evolution and novelty and out of equilibrium dynamics complexity methods include interacting particle systems self organized criticality and evolutionary game theory to simulate artificial stock markets and other phenomena theoretically bounded rationality replaces rational expectations complexity theory influences empirical methods and restructures policy debates

complicated endogenous business cycles under gross substitutability abstract in this paper we investigate the global behaviour of the output equilibrium time paths in a two dimensional overlapping generations model with productive investment and capital accumulation where agents behave rationally and markets are competitive we show that equilibrium time paths can converge to complicated chaotic attractors as well as periodic attractors when the substitution effect dominates the income effect everywhere the occurrence of complicated equilibrium paths is guaranteed by homoclinic intersections of the stable and unstable manifolds of the autarkic steady state journal of economic literature classificiation number e32

endogenous fluctuations in an open economy with increasing returns to scale in this paper we study the effects of opening an economy with increasing returns in the production of nontraded goods on the existence of multiple pareto ranked stationary equilibria local indeterminacy and bifurcations we consider a standard overlapping generation model of a small open economy with a fixed exchange rate where labour is the only input and money the only asset we find that when there are increasing returns the open economy may display persistent equilibrium endogenous fluctuations deterministic and stochastic in the balance of trade and main macroeconomic aggregates

on endogenous competitive business cycles the belief that the long run equilibrium of a competitive monetary economy that does not experience any exogeneous shocks whether originating from the external environment or from policy should be modelled as a state that is stationary or perhaps growing at a constant rate seems to be deeply rooted in the mind of some economists

geography health and the pace of demo economic development abstract this paper investigates the impact of subsistence consumption and extrinsic and intrinsic causes of child mortality on fertility and child expenditure it offers a theory for why mankind multiplies at higher rates at geographically unfavorable tropical locations placed into a macroeconomic framework this behavior creates an indirect channel through which geography shapes economic performance it is explained why it are countries of low absolute latitude where we observe exceedingly slow if not stalled economic development and demographic transition

changes in the federal reserve s inflation target causes and consequences this paper estimates a new keynesian model to draw inferences about the behavior of the federal reserve s unobserved inflation target the results indicate that the target rose from 1 1 4 percent in 1959 to over 8 percent in the mid to late 1970s before falling back below 2 1 2 percent in 2004 the results also provide some support for the hypothesis that over the entire postwar period federal reserve policy has systematically translated short run price pressures set off by supply side shocks into more persistent movements in inflation itself although considerable uncertainty remains about the true source of shifts in the inflation target jel e31 e32 e52

existence uniqueness and stability of equilibrium in an overlapping generations model with productive capital abstract this paper analyzes the existence uniqueness and stability of a steady state equilibrium in an overlapping generations model with productive capital it is shown that for any feasible set of well behaved preferences there exists a production function that satisfies the inada conditions under which the economy experiences global contraction and the steady state equilibrium is characterized by the absence of production and consumption the study establishes a strengthened inada condition which is necessary to preclude global contraction and sufficient conditions for the existence of a unique and globally stable non trivial steady state equilibrium

the term structure of interest rates in a dsge model with recursive preferences abstract a dynamic stochastic general equilibrium dsge model in which households have epstein and zin recursive preferences is solved with perturbation the parameters governing preferences and technology are estimated by maximum likelihood using macroeconomic data and the term structure of interest rates the estimates imply a large risk aversion an elasticity of intertemporal substitution higher than one and substantial adjustment costs furthermore the paper identifies the tensions within the model by estimating it on subsets of these data the analysis concludes by pointing out potential extensions that may improve the model s fit

regime switches agents beliefs and post world war ii u s macroeconomic dynamics the evolution of inflation and output over the last 50 years is examined through the lens of a micro founded model that allows for changes in the behavior of the federal reserve and in the volatility of structural shocks agents are aware of the possibility of regime changes and their beliefs have an impact on the law of motion underlying the macroeconomy the results support the view that there were regime switches in the conduct of monetary policy however the behavior of the federal reserve is identified by repeated fluctuations between a hawk and a dove regime instead of by the traditional pre and post volcker structure counterfactual simulations show that if agents had anticipated the appointment of an extremely conservative chairman inflation would not have reached the peaks of the late 70s and the inflation output trade off would have been less severe these beliefs counterfactuals are new in the literature finally the paper provides a bayesian algorithm to handle the technical difficulties that arise in a rational expectations model with markov switching regimes

a macro finance model of the term structure monetary policy and the economy this paper develops and estimates a macro finance model that combines a canonical affine no arbitrage finance specification of the term structure with standard macroeconomic aggregate relationships for output and inflation from this new empirical formulation we obtain several interesting results 1 the latent term structure factors from finance no arbitrage models appear to have important macroeconomic and monetary policy underpinnings 2 there is no evidence of monetary policy inertia or a slow partial adjustment of the policy interest rate by the federal reserve and 3 both forward looking and backward looking elements play important roles in macroeconomic dynamics

monetary policy regime shifts and inflation persistence abstract using bayesian methods we estimate a markov switching new keynesian msnk model that allows shifts in the monetary policy reaction coefficients and shock volatilities with u s data we find that a more aggressive monetary policy regime was in place after the volcker disinflation and before 1970 than during the great inflation of the 1970s our estimates also indicate that a low volatility regime has been in place during most of the sample period after 1984 we connect the timing of the different regimes to a measure of inflation persistence

equilibrium cycles in an overlapping generations economy with production abstract perfect foresight equilibrium trajectories of an overlapping generations model with production may include stable or unstable invariant closed curves these orbits are detected using the hopf bifurcation theorem where the parameter of bifurcation is purely technological the paper also proves that there is a stabilization policy that completely eliminates the cycle finally using a c e s production function it is shown that the range of values of the elasticity of substitution between capital and labor for which cycles may exist is bounded above

public spending endogenous growth and endogenous fluctuations abstract this article studies indeterminacy and endogenous growth in a simple one sector model of capital accumulation endowed with inelastic labor supply in which the presence of public goods creates positive externalities both in the production and the consumption sectors because of increasing returns in the utility function the economy exhibits not only perpetual growth but also indeterminacy and therefore endogenous stochastic growth fluctuations the possibility of sunspot equilibrium growth paths is shown to be consistent with plausible parameter values journal of economic literatureclassification numbers e32 o41 h40

deficits and cycles abstract this paper shows that periodic equilibria may arise in a simple overlapping generations model with capital if the government follows a policy of fixing the value of the deficit rather than fixing the value of government debt then the difference equation that describes competitive equilibria may posses complex roots in the neighborhood of the golden rule stationary state one may show that if there exist parametric families of economies for which these roots change stability then locally there exists an invariant closed curve the paper provides two simple examples that generate such equilibria and it solves these examples numerically

term structure evidence on interest rate smoothing and monetary policy inertia abstract numerous studies have used quarterly data to estimate monetary policy rules or reaction functions that appear to exhibit a very slow partial adjustment of the policy interest rate the conventional wisdom asserts that this gradual adjustment reflects a policy inertia or interest rate smoothing behavior by central banks however such quarterly monetary policy inertia would imply a large amount of forecastable variation in interest rates at horizons of more than 3 months which is contradicted by evidence from the term structure of interest rates the illusion of monetary policy inertia evident in the estimated policy rules likely reflects the persistent shocks that central banks face

expectation puzzles time varying risk premia and dynamic models of the term structure abstract linear projections of returns on the slope of the yield curve have contradicted the implications of the traditional expectations theory this paper shows that these findings are not puzzling relative to a large class of richer dynamic term structure models specifically we match all the key empirical findings reported by fama and bliss 1987 american economic review 77 4 680 692 and campbell and shiller 1991 review of economic studies 58 495 514 among others within large subclasses of affine and quadratic gaussian term structure models additionally we show that certain risk premium adjusted projections of changes in yields on the slope of the yield curve recover the coefficients of unity predicted by the models key to this matching are parameterizations of the market prices of risk that let the risk factors affect the market prices of risk directly and not only through factor volatilities the risk premiums have a simple form consistent with fama s findings on the predictability of forward rates and are also shown to be consistent with interest rate feedback rules used by a monetary authority in setting monetary policy

were there regime switches in u s monetary policy working paper 2004 14 june 2004 abstract a multivariate model identifying monetary policy and allowing for simultaneity and regime switching in coefficients and variances is confronted with u s data since 1959 the best fit is with a model that allows time variation in structural disturbance variances only among models that also allow for changes in equation coefficients the best fit is for a model that allows coefficients to change only in the monetary policy rule that model allows switching among three main regimes and one rarely and briefly occurring regime the three main regimes correspond roughly to periods when most observers believe that monetary policy actually differed and the differences in policy behavior are substantively interesting though statistically ill determined the estimates imply monetary targeting was central in the early 80s but was also important sporadically in the 70s the changes in regime were essential neither to the rise in inflation in the 70s nor to its decline in the 80s jel classification e52 e47 c53 key words counterfactuals lucas critique policy rule monetary targeting simultaneity volatility model comparison i the debate over monetary policy change in an influential paper clarida gali and gertler 2000 cgg presented evidence that us monetary policy changed between the 1970 s and the 1980 s indeed that in the 70 s it was drastically worse they found that the policy rule apparently followed in the 70 s was one that when embedded in most stochastic general equilibrium models would imply non uniqueness of the equilibrium and hence vulnerability of the economy to sunspot fluctuations of arbitrarily large size their estimated policy rule for the later period on the other hand eliminated this indeterminacy these results are a possible explanation of the volatile and rising inflation of the 70 s and of its subsequent decline the cgg analysis has two important weaknesses one is that it fails to account for stochastic volatility us macroeconomic variables and particularly the federal funds rate have gone through periods of tranquility and of agitation with forecast error variances varying greatly from period to period ignoring such variation does not lead to inconsistent estimates of model parameters when the forecasting equations themselves are constant but it strongly biases toward a finding of changed parameters tests of the stability of the forecasting equations the other weakness is that the cgg analysis rests on powerful and implausible identifying assumptions they require that we accept that the response of the monetary authority to expected future inflation and output does not depend on the recent history of inflation money growth or output it is hard to understand why this should be so especially in the 70 s when monetarism was a prominent theme in policy debates congress was requiring reports from the fed of projected time paths of monetary aggregates and financial markets were reacting sensitively to weekly money supply numbers the requirement for existence and uniqueness of equilibrium in dynamic models is that the monetary policy rule show a more than unit response of interest rates to the sum of the logs of all nominal variables that appear on the right hand side of the reaction function if we force a particular measure of expected future inflation to proxy for all the nominal variables that actually appear independently in the reaction function we are bound to get distorted conclusions on the one hand because expected future inflation will be a noisy measure of the full set of nominal influences on policy we might get downward bias in our estimates from the usual errorsin variables effect on the other hand to the extent that expected future inflation like most expected future values shows less variation than current nominal variables we could find a mistaken scaling up of coefficients

monetary policy regime switches and macroeconomic dynamics this article considers the determinacy and distributional consequences of regime switching in monetary policy although switching in the inflation target does not affect determinacy switches in the inflation response can cause indeterminacy satisfying the taylor principle period by period is neither necessary nor sufficient for determinacy when inflation responses switch indeterminacy can arise if monetary policy responds too aggressively to inflation in the active regime inflation target switches primarily impact the level of inflation whereas inflation response switches primarily impact the volatility expecting an inflation target switch has minor effects on volatility whereas expecting an inflation response switch raises volatility more substantially

the economics of options implied inflation probability density functions recently a market in options based on cpi in ation in ation caps and oors has emerged in the us this paper uses quotes on these derivatives to construct probability densities for in ation we study how these pdfs respond to news announcements and nd that the implied odds of de ation are sensitive to certain macroeconomic news releases we compare the option implied probability densities with those obtained by time series methods and use this information to construct empirical pricing kernels the options implied densities assign considerably more mass to extreme in ation outcomes either de ation or high in ation than do their time series counterparts this yields a u shaped empirical pricing kernel with investors having high marginal utility in states of the world characterized by either de ation or high in ation

why inflation rose and fell policy makers beliefs and u s postwar stabilization policy this paper provides an explanation for the run up of u s inflation in the 1960s and 1970s and the sharp disinflation in the early 1980s which standard macroeconomic models have difficulties in addressing i present a model in which rational policymakers learn about the behavior of the economy in real time and set stabilization policy optimally conditional on their current beliefs the steady state associated with the self confirming equilibrium of the model is characterized by low inflation however prolonged episodes of high inflation ending with rapid disinflations can occur when policymakers underestimate both the natural rate of unemployment and the persistence of inflation in the phillips curve i estimate the model using likelihood methods the estimation results show that the model accounts remarkably well for the evolution of policymakers beliefs stabilization policy and the postwar behavior of inflation and unemployment in the united states

adaptive learning and roads to chaos the case of the cobweb abstract we investigate the dynamics of the cobweb model with adaptive expectations a linear demand curve and a nonlinear s shaped increasing supply curve both stable periodic and chaotic price behaviour can occur we investigate how the dynamics of the model depend on the parameters both infinitely many period doubling and period halving bifurcations can occur when the demand curve is shifted upwards the same result holds with respect to the expectations weight factor

myopic and perfect foresight in the olg model we compare the dynamics under myopic foresight and under perfect foresight in an overlapping generations model with capital accumulation and two period lived individuals when the rational dynamics are defined and the myopic dynamics are monotonic the study of myopic foresight allows to characterize the dynamics under perfect foresight the study of myopic dynamics also allows to obtain a condition of uniqueness of the steady state that bears only on the second order derivatives of the utility and production functions

real business cycles in this paper we demonstrate how certain very ordinary economic principles lead maximizing individuals to choose consumption production plans that display many of the characteristics commonly associated with business cycles our explanation is entirely consistent with i rational expectations ii complete current information iii stable preferences iv no technological change v no long lived commodities vi no frictions or adjustment costs vii no government viii no money and ix no serial dependence in the stochastic elements of the environment we also provide a completely worked out example of the type of artificial economy we have in mind the time series properties of the example exhibit some major features of observed business cycles although this type of model may not be capable of explaining all of the regularities in actual business cycles we believe that it provides a useful well defined benchmark for assessing the relative importance of factors e g monetary disturbances