the inflation tax in a real business cycle model money is incorporated into a real business cycle model using a cash in advance constraint the model economy is used to analyze whether the business cycle is different in high inflation and low inflation economies and to analyze the impact of variability in the growth rate of money in addition the welfare cost of the inflation tax is measured and the steady state properties of high and low inflation economies are compared

generating real persistent effects of monetary shocks how much nominal rigidity do we really need abstract this paper attempts to assess whether money can generate persistent economic fluctuations in dynamic general equilibrium models of the business cycle we show that a small nominal friction in the goods market can make the response of output to monetary shocks large and persistent if it is amplified by real wage rigidity in the labor market we also argue that for plausible levels of real wage rigidity a small degree of nominal stickiness is sufficient for money to produce economic fluctuations as persistent as those observed in the data

the cyclical behavior of prices abstract the procyclical behavior of prices has been a staple of business cycle lore since the work of the early nber business cycle researchers this paper reexamines that empirical fact the aggregate data do not support procyclical price movements as a stable feature of the business cycle the only episode where it is a robust feature of the data is the period between the two world wars particularly the period of the great depression

the expectations hypothesis of the term structure of interest rates and monetary policy some evidence from asian countries abstractthis article outlines a panel data approach to modelling the term structure of interest rates in the short and in the long run we find robust evidence supporting the expectations hypothesis of the term structure ehts for a small sample of asian emerging markets furthermore we detect some relevant differences in the transmission mechanism of monetary policy and the existence of a mccallum 2005 rule no exogeneity of monetary policy to the yield curve in some countries finally we document the influence of an international global factor i e a time varying global risk premium on the yield curve while local country specific factors are not statistically significant

money new keynesian macroeconomics and the business cycle abstract we show in this paper that the typical modern business cycle cannot be reduced to the real business cycles archetype a monopolistic competition model with price adjustment costs affected by technological and monetary shocks better mimics the economic fluctuations in two countries with very different cyclical properties namely france and the united states in our model monetary shocks are necessary to reproduce the standard deviation of output the money output correlation the labour productivity worked hours relative standard deviation the labour productivity worked hours correlation and the mark up output correlation with two independent shocks one real more specifically defined than the solow residual and one nominal the model gives an answer to some empirical puzzles which were left unexplained by traditional rbc models

elusive persistence wage and price rigidities the new keynesian phillips curve and inflation dynamics abstract we review the main new keynesian inflation equations that have arisen as a result of aggregation from individual firms price rigidities we find that on the whole they cannot account for inflation persistence a key feature of the empirical dynamics of inflation and with important policy implications the only exceptions seem to be when indexation is allowed in price setting or when price stickiness is combined with wage rigidity and staggering

nominal price rigidity money supply endogeneity and business cycles abstract this paper investigates the ability of nominal price rigidity to explain the co movement of inflation with the cyclical component of output observed in the post war u s data a dynamic general equilibrium model is constructed with the introduction of monopolistic competition and nominal price rigidity in a standard real business cycle model allowing for an endogenous money supply rule it is then demonstrated that sticky price models can explain the observed associations between movements in inflation and output much better than flexible price models this result depends little on whether money supply is assumed to be endogenous or not

implications of state dependent pricing for dynamic macroeconomic models abstract state dependent pricing sdp models treat the timing of price changes as a profit maximizing choice symmetrically with other decisions of firms using quantitative general equilibrium models which incorporate a generalized s s approach we investigate the implications of sdp for topics in two major areas of macroeconomic research the early 1990s sdp literature and more recent work on persistence mechanisms first we show that state dependent pricing leads to unusual macroeconomic dynamics which occur because of the timing of price adjustments chosen by firms as in the earlier literature in particular we display an example in which output responses peak at about a year while inflation responses peak at about 2 years after the shock second we examine whether the persistence enhancing effects of two new keynesian model features namely specific factor markets and variable elasticity demand curves depend importantly on whether pricing is state dependent in an sdp setting we provide examples in which specific factor markets perversely work to lower persistence while variable elasticity demand raises it

some unpleasant properties of loglinearized solutions when the nominal rate is zero does fiscal policy have large and qualitatively different effects on the economy when the nominal interest rate is zero an emerging consensus in the new keynesian nk literature is that the answer to this question is yes evidence presented here suggests that the nk model s implications for fiscal policy at the zero bound may not be all that different from its implications for policy away from it for a range of empirically relevant parameterizations employment increases when the labor tax rate is cut and the government purchase multiplier is less than 1 05

sticky price models of the business cycle can the contract multiplier solve the persistence problem we construct a quantitative equilibrium model with firms setting prices in a staggered fashion and use it to ask whether monetary shocks can generate business cycle fluctuations these fluctuations include persistent movements in output along with the other defining features of business cycles like volatile investment and smooth consumption we assume that prices are exogenously sticky for a short time persistent output fluctuations require endogenous price stickiness in the sense that firms choose not to change prices much when they can do so we find that for a wide range of parameter values the amount of endogenous stickiness is small thus we find that in a standard quantitative model staggered price setting alone does not generate business cycle fluctuations

returns to scale market power and the nature of price rigidity in new keynesian models with self fulfilling expectations increasing returns to scale and firms market power are two potential sources of sunspot expectations in neoclassical models we show that in new keynesian models returns to scale and market power can have fundamentally different implications for broad macroeconomic issues including self fulfilling expectations depending on the nature of price rigidity our findings suggest that the design of stabilization monetary policy can depend on precise knowledge about the economy s real and nominal features therefore a clear understanding of the specific economic environment and its relevance to monetary policymaking for ensuring macroeconomic stability can be an integrated part of monetary policy practice

microeconomic rigidities and aggregate price dynamics abstract this paper is an attempt to enrich the characterization of the sluggish behavior of the aggregate price level our contribution to this vast literature is to explicitly consider microeconomic heterogeneity and its interaction with nonlinear microeconomic price adjustment policies the model we propose outperforms the constant probability of adjustment partial adjustment model in describing the path of postwar u s inflation using only aggregate data we infer that the probability that a firm adjusts its price depends on the sign and the magnitude of the deviation of the price from its target level at the aggregate level we find that the aggregate price level responds less to negative shocks than to positive shocks that the size of this asymmetry increases with the size of the shock and that the number of firms changing their prices and therefore the flexibility of the price level to aggregate shocks varies endogenously over time in response to changes in economic conditions

is there a financial accelerator in us banking evidence from the cyclicality of banks price cost margins abstract we show that price cost margins for us banks are consistently countercyclical even after controlling for credit risk the term structure of interest rates and monetary policy this evidence supports the existence of a financial accelerator in us banking

sticky prices fair wages and the co movements of unemployment and labor productivity growth abstract this paper studies the co movements of unemployment and labor productivity growth for the u s economy measures of co movements in the frequency domain indicate that co movements between variables differ strongly according to the frequency first long term and business cycle co movements are larger than short term co movements second co movements are negative in the short and long run but positive over the business cycle a new keynesian model that combines nominal rigidity on the goods market sticky prices and real rigidity on the labor market fair wages is shown to be quantitatively consistent with the observed co movements both in the long term and over the business cycle however the model fails to explain the short term co movements

sectoral variability and the foundations of optimal inflation rate abstractthe recent monetary search models argue that the real effects of inflation on economic activity can be gauged through relative price variability rpv our study uses a large panel data of

monetary policy and the term structure of interest rates in japan this paper uses japanese data to investigate the relationship between monetary policy and the yield curve we find that the response of the yield curve depends in an important way on the maintained hypothesis about how monetary policy affects the economy under the liquidity effect maintained hypothesis monetary policy only has transient effects on the yield curve under the costly price adjustment maintained hypothesis however monetary policy has large and persistent effects on yields of all maturities

vector rational error correction abstract systems of forward looking linear decision rules can be formulated as vector rational error correction models the closed form solution of the restricted error corrections is derived and a full information estimator is suggested the error correction format indicates that the assumptions of convex adjustment costs and rational expectations impose different types of a priori restrictions on the dynamic structure of the error corrections an empirical model of the producer decision rule for capital investment illustrates that the data rejects dynamic restrictions imposed by a standard model of adjustment costs but supports a more general description of convex frictions

production chains and general equilibrium aggregate dynamics abstract recent empirical studies reveal that monetary shocks can cause persistent fluctuations in aggregate output in this paper we propose a mechanism to help generate such persistence our dynamic stochastic general equilibrium model features a vertical input output structure with staggered price contracts at each stage of production working through the input output relations and the timing of firms pricing decisions the model generates persistent fluctuations in aggregate output and the observed patterns of price dynamics following a monetary shock output responses are more persistent the greater the number of stages of production and the larger the share of intermediate inputs with a sufficient number of stages the persistence is arbitrarily large if the share of intermediate inputs is one at all but finitely many stages

new keynesian dynamics in a low interest rate environment recent research has found that the dynamic properties of the new keynesian model are unorthodox when the nominal interest rate is zero improvements in technology and reductions in the labor tax rate lower economic activity and the size of the government purchase output multiplier is very large this paper provides evidence that these results are not empirically relevant we show that a prototypical new keynesian model fit to japanese data exhibits orthodox dynamics during japan s episode with zero interest rates we then demonstrate that this specification is more consistent with outcomes in japan than alternative specifications that have unorthodox properties

structural shocks and the comovements between output and interest rates stylized facts on u s output and interest rates have so far proved hard to match with simple dsge models i estimate covariances between output nominal and real interest rate conditional on structural shocks since such evidence has largely been lacking in previous discussions of the output interest rate puzzle conditional on shocks to technology and monetary policy the results square with simple models moreover permanent inflation shocks accounted for the counter cyclical and inversely leading behavior of the real rate during the great inflation 1959 1979 over the great moderation 1982 2006 technology shocks were more dominant and the real rate has been pro cyclical

persistency in sticky price models abstract nominal rigidities imply that nominal shocks have an impact effect which may be propagated by standard mechanisms however the nominal adjustment process may in itself be a propagation mechanism causing persistent effects of nominal shocks this may be caused by inertia in nominal wage and price adjustment arising due to input output networks or multiperiod nominal contracting as captured in models with staggered price wage decisions it has recently been contested whether staggering can account for persistency of any quantitative importance this paper reviews the theory and empirical evidence on this issue and it is concluded that staggering may be a quantitative important propagation mechanism

constructing and estimating a realistic optimizing model of monetary policy abstract a dynamic stochastic general equilibrium dsge model with real and nominal both price and wage rigidities succeeds in capturing some key nominal features of u s business cycles additive technology shocks as well as multiplicative shocks are introduced and shown to be crucial monetary policy is specified as an interest rate targeting rule following developments in the structural vector autoregression var literature the interaction between real and nominal rigidities is essential to reproduce the liquidity effect of monetary policy the model is estimated by maximum likelihood on u s data and its fit is comparable to that of an unrestricted first order var besides producing reasonable impulse responses and second moments this model replicates a feature of u s business cycles never captured by previous research with dsge models that an increase in interest rates predicts a decrease in output two to six quarters in the future

prices output and hours an empirical analysis based on a sticky price model abstract i show that a simple sticky price model based on rotemberg 1982 is consistent with a variety of facts concerning the correlation of prices hours and output it is consistent with the negative correlation between forecastable movements in prices and output as well as the smaller negative correlation between forecastable movements in prices and hours it is also consistent with the positive correlations of unexpected movements in prices output and hours these patterns are harder to reconcile with the flexible price version of the model in particular they require that money respond differently to forecastable and to unforecastable real shocks

partial adjustment and staggered price setting this paper compares taylor style staggered price setting to partial adjustment of prices or calvo staggering in a small optimizing is lm model in contrast to the overwhelming perception in the literature the models are not similar for most parameterizations in particular the dynamic response of the economy to shocks is quite different in the two models and the welfare cost of price rigidity is eight or more times larger in the calvo model than in the taylor model for typical calibrations suggestions for calibrations under which the models are more similar are also presented

factor complementarity and labour market dynamics abstract we propose and estimate a dynamic stochastic general equilibrium model featuring search and matching frictions deep habits and a ces production function the model successfully replicates the cyclical properties of labour market variables in the us economy for three main reasons first two of the endogenous mechanisms of the model factor complementarity and unemployment benefits play a key role for explaining the amplification in unemployment and vacancies second deep habits have a smaller but significant role as an endogenous mechanism third capital augmenting productivity investment specific and matching efficiency innovations explain large part of the variation in labour market variables

pricing production and persistence though built with increasingly precise microfoundations modern optimizing sticky price models have displayed a chronic inability to generate large and persistent real responses to monetary shocks as recently stressed by chari kehoe and mcgrattan 2000 this is an ironic finding since taylor 1980 and other researchers were motivated to study sticky price models in part by the objective of generating large and persistent business fluctuations we trace this lack of persistence to a standard view of the cyclical behavior of real marginal cost built into current sticky price macro models using a fully articulated general equilibrium model we show how an alternative view of real marginal cost can lead to substantial persistence this alternative view is based on three features of the supply side of the economy that we believe are realistic an important role for produced inputs variable capacity utilization and labor supply variability through changes in employment importantly these real flexibilities work together to dramatically reduce the elasticity of marginal cost with respect to output from levels much larger than unity in ckm to values much smaller than unity in our analysis these real flexibilities consequently reduce the extent of price adjustments by firms in time dependent pricing economies and the incentives for paying fixed costs of adjustment in state dependent pricing economies the structural features also lead the sticky price model to display volatility and comovement of factor inputs and factor prices that are more closely in line with conventional wisdom about business cycles and various empirical studies of the dynamic effects of monetary shocks federal reserve bank of philadelphia boston university nber and frb richmond this paper builds on earlier joint work with alexander l wolman on this topic we wish to thank brian boike for providing excellent research assistance and also to thank the referees and the editor for making numerous useful suggestions the views expressed in this article are those of the authors and do not necessarily represent those of the federal reserve bank of philadelphia the federal reserve bank of richmond or the federal reserve system

sticky prices new evidence from retail catalogs this paper presents new results on the size frequency and synchronization of price changes for twelve selected retail goods over the past 35 years three basic facts about the data are uncovered first nominal prices are typically fixed for more than one year although the time between changes is very irregular second prices change more often during periods of high overall inflation third when prices do change the sizes of the changes are widely dispersed both large and small changes occur for the same item and the sizes of these changes do not closely depend on overall inflation

market power in banking countercyclical margins and the international transmission of business cycles abstract by introducing an imperfectly competitive banking sector into a standard two country two good rbc model with complete asset markets we study the international transmission of aggregate tfp shocks in an environment with noncompetitive financial intermediation in this model price cost margins in a global loan market are endogenous and countercyclical as a result a positive tfp shock in one country spills over to another through a reduction in the global cost of both credit and externally financed investment the quantitative analysis shows that countercyclical margins on loans play a key role in bringing the predictions of the theory closer to the observed cross country cyclical co movements of consumption employment investment and output recessions are deeper when the cost of credit rises during these economic downturns thus a financial accelerator arises in our framework unveiling the increased importance of stabilization policies in economies where margins in credit markets are countercyclical

increasing returns and unsynchronized wage adjustment in sunspot models of the business cycle a challenge to models of equilibrium indeterminacy based on increasing returns is that required increasing returns for generating indeterminacy can be implausibly large and rise quickly with the relative risk aversion in labor we show that unsynchronized wage adjustment via a relative wage effect can both lower the required degree of increasing returns for indeterminacy to a plausible level and make it invariant to the relative risk aversion in labor consequently indeterminacy and sunspot driven fluctuations can emerge for plausible increasing returns regardless of the relative risk aversion in labor our model generates reasonable dynamics in terms of matching the business cycle and sunspot shocks become more important with labor market friction

an estimated canadian dsge model with nominal and real rigidities this paper develops a dynamic stochastic general equilibrium dgse model for the canadian economy and evaluates the real effects of monetary policy shocks to generate high and persistent real effects the model combines nominal frictions in the form of costly price adjustment with real rigidities modelled as convex costs of adjusting capital and employment

the cyclical behavior of prices and relative prices i introduction correlations between shocks to prices and output provide evidence on the source of macroeconomic shocks for example den haan 2000 found positive correlations at short forecast horizons and negative correlations at longer forecast horizons for the consumer price index cpi and the index of industrial production ip 1 he interpreted these results to mean that demand shocks dominate in the short run while supply shocks dominate in the long run several other papers confirm the positive correlation between the cpi and the ip at short forecast horizons on the other hand some of these same authors have found a negative correlation between real gross domestic product gdp and the gdp deflator at short forecast horizons 2 this difference is disappointing since the results provide conflicting evidence on the nature of shocks at short horizons and puzzling since the cpi and the deflator are positively correlated as are ip and gdp an important distinction between pairing gdp with its deflator and pairing ip with the cpi is the extent to which products in the output index are matched to products in the price index gdp and the gdp deflator are based on the same set of goods and services on the other hand ip contains products such as those produced by mining whose prices are not included in the cpi and the cpi includes products such as housing services that are not included in ip in this paper we argue that the correlation between mismatched price and output indexes such at the cpi and ip can be and often is misleading the explanation for why it is important to use matched indexes of price and output is simple suppose that you are interested in the correlation between the price and the quantity of apples if instead you compute the correlation between the price of oranges and the quantity of apples the correlation is correct only if the relative price of oranges to apples does not vary with the quantity of apples if the relative price varies then the mismatched correlation differs in magnitude from and may even have the opposite sign of the matched one correlations between both matched and mismatched pairs are mostly negative positive correlations are rare and small for matched pairs but more frequent for mismatched pairs for example investment and the investment deflator are negatively correlated while investment and the consumption deflator are positively correlated our analysis below shows that these correlations imply that the relative price of consumption to investment may be positively correlated with investment previous authors have noted that the relative price of nondurables is procyclical which is consistent with the bias we find for mismatches these previous results are based on correlations between detrended variables we confirm that these findings hold when considering the correlation between forecast errors of the relative price of nondurables to durables and output measures 3 because there is no price index that matches ip and because correlations between mismatched price and output measures likely differ in size and may have the opposite sign of the correlation for matched pairs there is no way to be certain of the cyclical nature of the prices of goods included in the index of ip an examination of gdp components and price deflators provides reasons to be skeptical of the positive correlation between the cpi and the ip first matched pairs of price indexes and gdp components have small or negative correlations second correlations between mismatched price indexes and gdp components show that the bias created by mismatches is sometimes substantial further this bias tends to be positive when prices of nondurable goods such as the cpi or consumption deflator are mismatched with gdp components composed mostly of durable goods finally when ip is paired with deflators for durables investments or goods the correlation is either small or negative at short forecast horizons

imperfect credibility and inflation persistence in this paper we formulate a dynamic general equilibrium model with staggered nominal contracts in which households and rms use optimal ltering to disentangle persistent and transitory shifts in the monetary policy rule the calibrated model accounts quite well for the dynamics of output and insation during the volcker disinsation and implies a sacri ce ratio very close to the estimated value our approach indicates that insation persistence and substantial costs of disinsation can be generated in an optimizing agent framework without relaxing the assumption of rational expectations or relying on arbitrary modi cations to the aggregate supply relation jel classi cation e31 e32 e52

technical efficiency and co2 abatement policies in the dutch glasshouse industry this paper develops a short run microeconomic simulation model of the dutch glasshouse industry in order to investigate the relation between technical efficiency and marginal abatement costs of co2 emission the model is also used to determine the effects of an emission tax and systems of tradable and non tradable quota for groups of firms with different rates of technical efficiency the results show that marginal abatement costs are very responsive to changes in technical efficiency furthermore it is found that firms with a low technical efficiency are faced with a higher profit reduction under different abatement policies than firms with a high technical efficiency

life cycle labour supply with human capital econometric and behavioural implications i examine econometric and behavioural implications of including human capital in the life cycle labour supply model with human capital the wage is no longer the price of time which is instead the wage plus returns to work experience this has important implications first labour supply elasticities become functions of both preference and wage process parameters one cannot estimate them separately second the data appear consistent with larger elasticities than prior work suggests third contrary to conventional wisdom permanent tax changes can have larger effects on current labour supply than temporary changes fourth effects of permanent tax changes grow over time

real business cycle models and the forecastable movements in output hours and consumption the authors study the movements in output consumption and hours that are forecastable from a vector autoregression and analyze how they differ from those predicted by standard real business cycle models they show that actual forecastable movements in output have a variance about one hundred times larger than those predicted by the model the authors also find that forecastable changes in the three series are strongly positively correlated with each other on the other hand for parameters whose implications are plausible in other respects the model implies that output consumption and hours should not all be expected to move in the same direction copyright 1996 by american economic association

money and interest in a cash in advance economy the authors analyze an aggregative general equilibrium model in which the use of money is motivated by a cash in advance constraint applied to purchases of a subset of consumption goods the system is subject to both real and monetary shocks which are economy wide and observed by all they develop methods for verifying the existence of characterizing and explicitly calculating equilibria copyright 1987 by the econometric society

sticky price models of the business cycle can the roundabout production solve the persistence puzzle abstract this paper considers the persistence puzzle unveiled by chari et al 2000 our findings show that endogenously persistent output dynamics are not a puzzle for the standard sticky price model once roundabout production is taken into account we make this point using a new keynesian framework emphasizing an inertial mechanism called the multiplier for price stickiness in the spirit of basu 1995

identification long run relations and fundamental innovations in a simple cointegrated system this paper examines the roles played by innovations identified from a simple four variable var characterized by cointegration using knowledge of cointegration rank and textbook relations that link macroeconomic aggregates we identify distinct real and nominal innovations that dictate the long run behavior of the model we also examine the explanatory power of transitory innovations that are orthogonal to these permanent shocks one of the permanent shocks displays all the characteristics of a technology or supply innovation while one of the transitory innovations identified by imposing short run price rigid ity is interpretable as a demand side impulse the permanent nominal shock bears the imprint of an innovation in aggregate inflation expectations historical decomposition and comparison with variables that are external to the model reveals the relative importance of the shocks at various episodes

the contemporaneous correlation between price shocks and output shocks until the 1990s prices were believed to be procyclical several researchers have since presented evidence of counter cyclical prices this evidence proved robust but its interpretation has varied some have argued that the contemporaneous correlation between output and prices reflects both the source of the current shock and the adjustment process from short run to long run equilibrium the adjustment to the long run imparts a bias towards a negative price output correlation the issue of dynamics is addressed by estimating price shocks and output shocks the sign of the correlation between these shocks does not reveal anything about the relative importance or frequency of demand versus supply shocks however some understanding is gained from the time series of the product of the shocks in periods when the product is negative supply shocks must have been either relatively large or relatively important in periods when the product is positive demand shocks must have been either relatively large or re

the comovement between output and prices abstract in this paper i analyze the comovement of us prices and output in the postwar period i use a new set of statistics to characterize the comovement between variables the statistics capture important information about the dynamics in the system the estimation procedure does not require assumptions about the order of integration or the types of assumptions needed for var decompositions i find that the comovement between output and prices is positive in the short run and negative in the long run i show that a model in which demand shocks dominate in the short run and supply shocks dominate in the long run can explain these empirical results while sticky price models with only demand shocks cannot

a tale of two correlations evidence and theory regarding the phase shift between the price level and output abstract we examine the relationship between the price level and output at business cycle frequencies in the postwar period there is evidence of a phase shift between the price level and output such a phase shift is manifested in the price level being countercyclical and the inflation rate being procyclical or acyclical depending on the detrending method used our examination takes three approaches first we apply bootstrapping methods to characterize the two correlations though the methodology could easily be extended to any set of facts second we specify a model economy with forecast heterogeneity showing numerically that this model economy can match the observed pair of correlations third we apply robust control theory deriving conditions in which the price level is countercyclical and the inflation rate is procyclical

the cyclical behavior of prices interpreting the evidence previous studies of the cyclical behavior of prices have found that the cross correlations between output and prices in post wwii u s data are generally negative these correlations h have been interpreted as being more consistent with supply driven models of business cycle fluctuations than with models that focus on demand shocks in this paper the authors show that the signs of price output correlations provide little information about the underlying shock for instance a simple keynesian model driven by demand shocks leads to negative correlations between these variables the authors results suggest that price output correlations may not be a particularly useful way to characterize the cyclical behavior of prices copyright 1995 by ohio state university press

nominal inertia and shock persistence in uk business cycles a structural var methodology is used for uk data to identify and map out the effects of innovations in the money supply employment output wages and prices moreover bands of two standard errors are computed for the impulse response functions so that comment may be made on the significance of the dynamic responses of the variables to the simulated shocks this allows conclusions to be drawn on the persistence of shocks results suggest that output variation is largely determined by aggregate demand shocks over the business cycle frequency importantly evidence is also found of rigidities in the form of price inertia and nominal wage stickiness

real rigidities and nominal price changes a large literature seeks to provide microfoundations of price setting for macro models a challenge has been to develop a model in which monetary policy shocks have the highly persistent efiects on real variables estimated by many studies nominal price stickiness has proved helpful but not su cient without some form of real rigidity or strategic complementarity we embed a model with a real rigidity a la kimball 1995 wherein consumers ee from relatively expensive products but do not ock to inexpensive ones we estimate key model parameters using micro data from the u s cpi which exhibit sizable movements in relative prices of substitute products when we impose a signiflcant degree of real rigidity fltting the micro price facts requires very large idiosyncratic shocks and implies large movements in micro quantities

identifying the influences of nominal and real rigidities in aggregate price setting behavior we formulate a generalized price setting framework that incorporates staggered contracts of multiple durations and that enables us to directly identify the influences of nominal vs real rigidities we estimate this framework using macroeconomic data for germany 1975 1998 and for the u s 1983 2003 in each case we find that the data are well characterized by nominal contracts with an average duration of about two to three quarters we also find that new contracts exhibit very low sensitivity to marginal cost corresponding to a relatively high degree of real rigidity finally our results indicate that backward looking price setting behavior such as indexation to lagged inflation is not needed in explaining the aggregate data at least in an environment with a stable monetary policy regime and a transparent and credible inflation objective