Behavior Of Inflation Research Articles

The hump-shaped behavior of inflation and a dynamic externality

We propose a general equilibrium model that explains the empirical evidence of the hump-shaped response of inflation to a monetary policy shock. The model replaces backward-looking indexation a la Christiano et al. [2005. Nominal rigidities and the dynamic effect of a shock to monetary policy. Journal of Political Economy 113(1), 1–45] with a dynamic externality into the production function of firms. The model, armed with sticky wages and variable capital utilization, has two offsetting effects on real marginal cost over the business cycle. First, increasing factor prices raise real marginal cost in response to an expansionary monetary policy shock in the intermediate run. Second, a dynamic externality reduces real marginal cost in the short run because it raises productivity in response to an increase in output following the shock. Overall, the resulting short-run decrease and intermediate-run increase in marginal cost replicate the hump-shaped behavior of inflation under purely forward-looking price and wage Phillips curves.

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.

THE SOUTH AFRICAN PHILLIPS CURVE: HOW APPLICABLE IS THE GORDON MODEL?

AbstractIs there a Phillips curve relationship present in South Africa and if so, what form does it take? Traditionally the method to establish whether or not there is a relationship between the output gap and the change in inflation is merely to regress the latter on the former. This yields the well‐known augmented Phillips curve. However, Gordon has argued that this specification of the Phillips curve produces biased results. Instead, he puts forward and estimates successfully for several industrialised countries his so‐called triangular model that tests for hysteresis and inertia in the behaviour of inflation, as well as the impact on inflation of changes in the output level. This paper considers whether or not Gordon's triangle model is applicable to South Africa, i.e. are hysteresis and inertia present in South Africa? In addition, in an attempt to find a better estimation of the output gap, the paper also experiments with alternative ways to estimate the long‐run output level, including the standard HP‐filter, as well as a production function approach.

New Keynesian Explanations of Cyclical Movements in Aggregate Inflation and Regional Inflation Differentials

What determines the cyclical behavior of aggregate inflation and regional inflation differentials? The answer has strong implications for monetary policy and in Europe for the Stability and Growth Pact. In the United States, inflation rates move pro-cyclically, and across the Euro Area, inflation differentials are positively correlated with growth differentials. This suggests that demand shocks are the primary determinants of the cyclical behavior of aggregate inflation and regional inflation differentials. In this paper, we discuss New Keynesian explanations of these correlations, and we argue that demand shocks are either missing or inadequately modeled in the in typical New Keynesian model.

Inflation Persistence and Optimal Monetary Policy in the Euro Area

In this paper we first present supporting evidence of the existence of heterogeneity in inflation dynamics across euro area countries. Based on the estimation of New Phillips Curves for five major countries of the euro area, we find that there is significant inertial (backward looking) behavior in inflation in four of them, while inflation in Germany has a dominant forward looking component. In the second part of the paper we present an optimizing agent model for the euro area emphasizing the heterogeneity in inflation persistence across regions. Allowing for such a backward looking component will affect the evaluation of the degree of nominal rigidities relevant for the monetary policy design. We explore the welfare implications of this circumstance by comparing the adjustment of the economies and the area as a whole in response to terms-of-trade shocks under four monetary policy rules: fully optimal, optimal inflation targeting, HICP targeting and output gap stabilization.

Interpreting Euro Area Inflation at High and Low Frequencies

Several authors have recently interpreted the ECB's two-pillar framework as separate approaches to forecast and analyse inflation at different time horizons or frequency bands. The ECB has publicly supported this understanding of the framework. This paper presents further evidence on the behaviour of euro area inflation using band spectrum regressions, which allow for a natural definition of the short and long run in terms of specific frequency bands, and causality tests in the frequency domain. The main finding is that variations in inflation are well explained by low-frequency movements of money and real income growth and high-frequency fluctuations of the output gap.

Modelling Inflation Dynamics: A Critical Review of Recent Research

In recent years, a broad academic consensus has arisen around the use of rational expectations sticky-price models to capture inflation dynamics. These models are seen as providing an empirically reasonable characterization of observed inflation behavior once suitable measures of the output gap are chosen; and, moreover, are perceived to be robust to the Lucas critique in a way that earlier econometric models of inflation are not. We review the principal conclusions of this literature concerning: 1) the ability of these models to fit the data; 2) the importance of rational forward-looking expectations in price setting; and 3) the appropriate measure of inflationary pressures. We argue that existing rational expectations sticky-price models fail to provide a useful empirical description of the inflation process, especially relative to traditional econometric Phillips curves of the sort commonly employed for policy analysis.

Intrinsic and Inherited Inflation Persistence

In the now conventional view of the inflation process, the New Keynesian Phillips Curve (NKPC) captures most of the persistence in inflation. The sources of persistence are twofold. First, the for inflation - the output gap or, more commonly, real marginal cost - is itself quite persistent, and a casual inspection of the NKPC reveals that inflation must inherit this persistence. Second, a modest amount of backward-looking or indexing behavior imparts some persistence to inflation. This latter source is generally thought to be of less importance than the former, as the degree of autocorrelation in the driving processes is substantial. This paper shows that in practice inflation in the NKPC inherits very little of the persistence of the driving process, and, contrary to conventional wisdom, it is intrinsic persistence that constitutes the dominant source of persistence. The paper explores the reasons for this and links them to two empirical observations. First, it has been difficult to develop a sizable coefficient on the driving process in NKPCs. Second, the shock that enters the NKPC, while often difficult to motivate economically, is large and is critical in distinguishing the sources of inflation persistence. While these observations help to clarify the behavior of inflation in NKPCs, they raise other fundamental questions about how to model inflation.

Fiscal Policy and Macroeconomic Stability within a Monetary Union

We analyse the stability of countries within a monetary union in the face of asymmetric shocks, using a simple but widely applicable model. We show that members of the union may be subject to severe cycles following asymmetric shocks if there is a significant backward looking element in inflation behaviour. This cyclical instability can be mitigated if fiscal policy in each member country reacts to inflation differences, but it can be aggravated if fiscal feedback on debt is too strong. Although these results can only be derived analytically for a model with static consumption, numerical analysis suggest that they remain valid for a more conventional model involving intertemporally optimising consumers.

The Role of Sticky Prices in an Open Economy Dsge Model: A Bayesian Investigation

In this paper we use a Dynamic Stochastic General Equilibrium (DSGE) model for an open economy to examine the role of sticky prices in explaining the joint behaviour of inflation and a fairly large set of macroeconomic variables. We find that price stickiness is an important feature for firms active in the domestic, export and import sectors, even though the model embodies variable capital utilisation, a working-capital channel and a time-varying inflation target. We also document that price stickiness in all sectors is important even if the markup shocks are allowed to be autocorrelated, although the implied average contract duration falls substantially under this assumption. (JEL: E40, E50, C11)

Analysis of discrete and continuous distributions of ventilatory time constants from dynamic computed tomography

In this study, an algorithm was developed to measure the distribution of pulmonary time constants (TCs) from dynamic computed tomography (CT) data sets during a sudden airway pressure step up. Simulations with synthetic data were performed to test the methodology as well as the influence of experimental noise. Furthermore the algorithm was applied to in vivo data. In five pigs sudden changes in airway pressure were imposed during dynamic CT acquisition in healthy lungs and in a saline lavage ARDS model. The fractional gas content in the imaged slice (FGC) was calculated by density measurements for each CT image. Temporal variations of the FGC were analysed assuming a model with a continuous distribution of exponentially decaying time constants. The simulations proved the feasibility of the method. The influence of experimental noise could be well evaluated. Analysis of the in vivo data showed that in healthy lungs ventilation processes can be more likely characterized by discrete TCs whereas in ARDS lungs continuous distributions of TCs are observed. The temporal behaviour of lung inflation and deflation can be characterized objectively using the described new methodology. This study indicates that continuous distributions of TCs reflect lung ventilation mechanics more accurately compared to discrete TCs.

Accounting for Stability

There is no consensus about the causes of the reduction in business cycle volatility seen in many major economies over the last decade. Using stylised models of the economies of the US, Euro area, UK and Japan, we argue that economic stability has been fostered by improved monetary policy and by associated changes in the behaviour of inflation, which has itself led to a reduction in the volatility of economic shocks. Our projections suggest that a number of major economies could continue to enjoy an unusual degree of stability, granted average luck and current institutions. (JEL E3, E52, F01)

Experimental Evidence on the Persistence of Output and Inflation

This paper presents experimental evidence from a monetary sticky price economy in which output and inflation depend on expected future inflation. With rational inflation expectations, the economy does not generate persistent deviations of output and inflation in response to a monetary shock. In the experimental sessions, however, output and inflation display considerable persistence and regular cyclical patterns. Such behaviour emerges because subjects’ inflation expectations fail to be captured by rational expectations functions. Instead, a Restricted Perceptions Equilibrium (RPE), which assumes that agents use optimal but ’simple’ forecast functions, describes subjects’ inflation expectations surprisingly well and explains the observed behaviour of output and inflation.

The New Keynesian Phillips Curve in Europe: Does it Fit or Does it Fail?

The canonical New Keynesian Phillips curve specifies inflation as the present-value of future real marginal costs. This paper exploits projections of future real marginal costs generated by VAR models to assess the model’s ability to match the behavior of actual inflation in the Euro area. The model fits the data well at first sight. A set of bias-corrected bootstrapped confidence bands, however, reveals that this result is consistent with both a well fitting and a failing model. These findings also hold for the hybrid version of the Phillips curve.

Does Product Market Competition Reduce Inflation? Evidence from EU Countries and Sectors

In this paper we explore the link between the of product market and inflation rates across EU countries and sectors. We consider long-term averages of inflation rates in order to remove the cyclical behavior of inflation over time and as alternative proxies of we use the level of mark-up, profit margin, the profit rate and a survey based intensity of competition variable. Results for both aggregate and sectoral panels show that the extent of product market competition, as proxied by the level of mark-up in particular, is an important driver of inflation. Notwithstanding some caveats associated with the measurement of the proxies of used, our findings suggest that higher product market reduces average inflation rates for a prolonged period of time. Moreover, results both at the aggregate and sectoral level are generally confirmed by a wide set of robustness tests.

Does Labor's Share Drive Inflation?

A number of researchers have recently argued that the new-Keynesian Phillips curve matches the empirical behavior of inflation well when the labor income share is used as a driving variable, but fits poorly when deterministically detrended output is used. The theoretical motivation for these results rests on the idea that the output gap—the deviation between actual and potential output—is better captured by the labor income share, in turn implying that central banks should raise interest rates in response to increases in this variable. We show that the empirical evidence generally suggests that the labor share version of the new-Keynesian Phillips curve is a very poor model of price inflation. We conclude that there is little reason to view the labor income share as a good measure of the output gap, or as an appropriate variable for incorporation in a monetary policy rule.

Modelling Inflation Dynamics: A Critical Review of Recent Research

In recent years, a broad academic consensus has arisen around the use of rational expectations sticky-price models to capture inflation dynamics. These models are seen as providing an empirically reasonable characterization of observed inflation behavior once suitable measures of the output gap are chosen; and, moreover, are perceived to be robust to the Lucas critique in a way that earlier econometric models of inflation are not. We review the principal conclusions of this literature concerning: 1) the ability of these models to fit the data; 2) the importance of rational forward-looking expectations in price setting; and 3) the appropriate measure of inflationary pressures. We argue that existing rational expectations sticky-price models fail to provide a useful empirical description of the inflation process, especially relative to traditional econometric Phillips curves of the sort commonly employed for policy analysis and forecasting.

Čtyři zamyšlení nad cílováním inflace v České republice

The paper consists of four parts each of them devoted to a practical aspect of inflation targeting as conducted by the Czech National Bank. The first part outlines the reasons that led to the adoption of this monetary regime and summarises other advantages for effective and transparent decision-making. The second part addresses the issue of missing inflation targets. It is argued that simple confrontation of targets with actual behaviour of inflation may give a distorted view about the actual performance of monetary policy. The third part discusses a subtle methodological controversy about the difference between so-called escape clauses on the one hand and net inflation on the other. In the last section the author presents his critical view about the role of unconditional forecast in its capacity to indicate future interest rate decisions and to provide a realistic description of transmission mechanism in a small open economy.

Inflationary attractor in the braneworld scenario

We demonstrate the attractor behavior of inflation driven by a scalar or tachyon field in the context of the recently proposed four-dimensional effective gravity induced on the world-volume of a three-brane in five-dimensional Einstein gravity, and we obtain a set of exact inflationary solutions. The phase portraits indicate that an initial kinetic term decays rapidly and does not prevent the onset of inflation. The trajectories more rapidly reach the slow rolling curve in the braneworld scenario than in the standard cosmology.

Technology Shocks in the New Keynesian Model

In the New Keynesian model, preference, cost-push, and monetary shocks all compete with the real-business-cycle model's technology shock in driving aggregate fluctuations. A version of this model, estimated via maximum likelihood, points to these other shocks as being more important for explaining the behavior of output, inflation, and interest rates in the postwar U.S. data. These results weaken the links between the current generation of New Keynesian models and the real-business-cycle models from which they were originally derived. They also suggest that Federal Reserve officials have often faced difficult trade-offs in conducting monetary policy.