WELFARE COSTS OF SHIFTING TREND INFLATION: STAGGERED WAGE AND PRICE CONTRACTS

We develop a New Keynesian model featuring staggered price and wage contracts to study welfare costs of exogenous variations in trend inflation. The analyses show that the consequences of constant positive trend inflation and shifting trend inflation are severe, especially when trend inflation is high. Among two channels, staggered wage contracts play a vital role in transmitting adverse impacts of constant and shifting trend inflation into the economy. Without the staggered wage channel, these costs are modest. We also conduct exercises to examine the sensitivity of welfare costs to a wide range of plausible parameters. The results show that if the price and wage friction are sufficiently large, the price and wage indexation level are sufficiently small, or there is upward biased trend inflation process, the welfare costs become larger.     

INFLATION PERSISTENCE AND FLEXIBLE PRICES*

If the central bank follows an interest rate rule, then inflation is likely to be persistent, even when prices are fully flexible. Any shock, whether persistent or not, may lead to inflation persistence. In equilibrium, the dynamics of inflation are determined by the evolution of the spread between the real interest rate and the central bank's target. Inflation persistence can be characterized by a vector autocorrelation function relating inflation and output. This article shows that a flexible‐price, general‐equilibrium business cycle model with money and a central bank using an interest rate target can account for such inflation persistence.     

PRICE DISPERSION,INFLATION, AND WELFARE*

We examine the implications of inflation for both price dispersion and welfare in a monetary search economy. In our economy, if the degree of buyers' incomplete information about prices is fixed, both price dispersion and real prices are increasing in inflation. As the inflation rate approaches the Friedman rule, both price dispersion and welfare losses vanish. If households choose the number of prices to observe, then the optimal inflation rate may exceed the Friedman rule as inflation induces search and, up to a point, raises welfare by eroding market power.     

MARKET POWER,PRICE ADJUSTMENT,AND INFLATION*

We study a monetary search economy in which endogenous fluctuations in market power driven by changes in consumers' search intensity determine the extent of price adjustment to movements in productivity and the money growth rate. A calibrated version of the economy exhibits countercyclical fluctuations in markups and is consistent with the observed incomplete response of nominal prices to cost movements associated with productivity fluctuations and to changes in the money growth rate. Furthermore, a higher average rate of inflation results in a lower average markup and increases the sensitivity of prices to fluctuations in either productivity or money growth.     

UK INFLATION: PERSISTENCE, SEASONALITY AND MONETARY POLICY

In the light of the changes to UK monetary policy since the early 1980s, we study the existence and nature of changes in the properties of retail price inflation over this period. A feature of our analysis is the attention paid to the marked seasonal pattern of monthly UK inflation. After taking account of seasonality, both univariate and Phillips curve models provide strong evidence of changes in the level and persistence of inflation around the end of 1992, at the time of the introduction of inflation targeting. Indeed, all models point to the effective disappearance of inflation persistence after this date, implying that constant-parameter models estimated using both pre- and post-inflation targeting data periods should be treated with considerable caution.     

INFLATION AND VARIETY*

Economies undergoing high inflation often experience a reduction of product variety in the marketplace. Existing models study how inflation affects quantity, but very few have studied how inflation affects variety. In a monetary model with explicit microfoundations, I analyze how inflation affects variety as well as quantity. I consider two pricing mechanisms—bargaining and price posting with directed search. I show that inflation reduces both quantity and variety under both pricing mechanisms. Quantitatively, the model implies that the total welfare cost of 10% inflation ranges from 4.77% to 8.4% under bargaining and is 1.52% under price posting.     

中国贸易开放与通货膨胀持续性关系研究

本文分别利用修正的综合贸易强度公式和卡尔曼滤波方法估计了中国改革开放以来的贸易开放度和时变的通货膨胀持续性,并在此基础上对中国贸易开放与通货膨胀持续性关系进行了实证研究。结果表明:中国贸易开放度的变化表现出明显的阶段性特征;中国的通货膨胀持续性处于不断波动的过程中,从趋势来看,中国的通货膨胀持续性呈现出不断下降的趋势;贸易开放度的提高对中国的通货膨胀持续性具有显著的负向影响。     

INFLATION ACCOUNTING FOR THE FEDERAL REPUBLIC OF GERMANY RESULTS USING DIFFERENT DEFLATOR PRICE INDICES

The purpose of inflation accounting as proposed by Jack Hibbert¹ is to show the changes in purchasing power of the assets and liabilities by sectors resulting from general price movements. This paper shows the results of inflation accounting for the Federal Republic of Germany on the basis of complete balance sheets for the sectors "Private households,""Enterprises,""General government" and "Rest of the world" in 1980. It is evident that the results of inflation accounting depend to a high degree on the kind of price index which is used as an indicator of the changes in the purchasing power of money in general. The price index for inflation accounting should in general be selected according to the aim of the analysis. On the other hand, however, the validity of the results of inflation accounting depends on and is limited by the price index chosen for that purpose. The figures presented also show that the results of inflation accounting depend to a high degree on whether estimates of the value of tangible assets are included or not. This holds for reproducible tangible assets as well as for land.     

农产品价格上涨和通货膨胀的 互动机制及共同原因

本文从金融市场的实际汇率、真实利率水平和劳动力市场的农业劳动力成本等角度分析二者之间的互动机制,认为通货膨胀通过农民的存粮行为、投资的促进、汇率传导三种机制影响农产品价格水平;而在刘易斯转折点出现的条件下,农产品价格通过劳动力成本的上升这一渠道导致一般物价水平上升,并且影响程度持续上升。本文对这些假说进行了理论分析后使用VAR模型进行经验研究,提出需求面的因素是价格水平变化的主要原因,供给面的因素是农产品价格变化的主要原因。应减少金融市场的扭曲程度,提升真实利率和人民币币值以抑制通货膨胀;在供给方面应改进农业的投入和生产模式,把劳动力成本上升和技术进步结合在一起,同时利用国际农产品市场稳定国内价格水平。     

INFLATION TARGETING AND THE STATIONARITY OF INFLATION: NEW RESULTS FROM AN ESTAR UNIT ROOT TEST

In this paper, we examine the time series properties of inflation in seven countries that have adopted inflation targeting. Unlike previous studies, we utilize a non‐linear mean reverting adjustment mechanism for inflation and we discover that, although deviations of inflation from the target can exhibit a region of non‐stationary behaviour, overall they are stationary indicating successful targeting implementation.     

INCENTIVE CONTRACTS AND TOTAL FACTOR PRODUCTIVITY*

We propose a transactions cost theory of total factor productivity (TFP). In a world with asymmetric information and transactions costs, productivity must be induced by incentive schemes. Labor contracts trade off marginal benefits and costs of effort. The latter include, in addition to the workers' marginal disutility of effort, organizational costs and rents. As the economy grows, contracts change endogenously, inducing higher effort and productivity. Transactions costs are also affected by societal characteristics that determine the power of incentives. Differences in these characteristics may explain cross‐economy productivity differences. Numerical experiments demonstrate the model's consistency with time‐series and cross‐country observations.     

THE AD-AS MODEL AND ITS SOLUTIONS: SOME NEW RESULTS IN A DISEQUILIBRIUM PERSPECTIVE*

This paper discusses the logical foundation and the solutions of a microfounded aggregate demand … aggregate supply model under the disequilibrium hypothesis. We first show that a) the latter hypothesis is the only one ensuring model consistent expectations and that b) price predetermination, more than price flexibility, should be embodied in an AD-AS framework. Then we develop a full AD-AS scheme, both under excess supply and excess demand for labour. We prove that in the latter case no well defined equilibrium exists. Finally, we discuss stability and perform some comparative statics exercises.