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.     

MONEY HOLDINGS,INFLATION, AND WELFARE IN A COMPETITIVE MARKET*

This article examines an environment where money is essential and agents exchange in perfectly competitive, Walrasian markets. Agents consume and produce a homogeneous good, but hold money to purchase consumption in the event of a relatively low productivity shock. A Walrasian market delivers a nondegenerate distribution of money holdings across agents and avoids some of the computational difficulties associated with the market assumption of bilateral bargaining common to search‐theoretic environments. The model is calibrated to long‐run U.S. velocity, and the welfare costs of inflation are assessed for variable buyer–seller ratios and persistent states of buying and selling.     

通货膨胀、政府收益与社会福利损失

传统"Cagan规则"认为,政府通货膨胀税收益最大化的条件是,通货膨胀率应该为(货币需求关于)利率半弹性的倒数。这一规则是局部均衡条件下的结果,并未考虑通胀的实际经济效应。本文基于交易成本方法在一般均衡框架内讨论收益最大化时通货膨胀率的决定问题。该框架中收益最大化的通货膨胀率小于Ca-gan规则值,这一结论得到了中国1945—1949年恶性通胀时期经验数据的支持。经验结果还表明,相对于Cagan规则,根据交易成本方法设定的通货膨胀率尽管并没有明显提高政府的通货膨胀税收益,却大幅降低了社会福利损失。     

不确定性、通货膨胀与产出增长

基于中国1952—2004年的数据,通过GARCH-M模型和广义脉冲响应函数对不确定性、通货膨胀与产出增长进行实证分析。结果发现:通货膨胀不确定性与产出增长负相关;产出增长不确定性与产出增长负相关;产出增长不确定性与通货膨胀正相关;通货膨胀不确定性与通货膨胀负相关;产出增长冲击和通货膨胀冲击对产出增长不确定性和通货膨胀不确定性的影响存在滞后性和非对称性;产出增长对产出增长冲击的动态响应最大,通货膨胀对产出增长冲击的动态响应以及产出增长对通货膨胀冲击的动态响应最小,通货膨胀对通货膨胀冲击的动态响应居中。     

MONEY, OUTPUT AND INFLATION IN CLASSICAL ECONOMICS

‘Of all the constituent parts of the science of PoliticalEconomy none is perhaps so inseparably bound up with the totalityof the general theory as is the theory of money’ (KarlHelfferich, Das Geld, 1903).     

DEPRIVATION,INEQUALITY AND WELFARE*

Welfare ranking of income distributions involves a trade‐off between equity and efficiency. A person's feeling of deprivation about higher incomes may be of a relative or absolute type. We consider an intermediate notion of deprivation, a convex mix of relative and absolute deprivations. We then look at the problem of welfare ranking of income distributions when welfare increases under a globally equitable redistribution and under an income increase that keeps intermediate deprivation fixed. All deprivation indices can be regarded as inequality indices but the converse is not true. We also provide a numerical illustration of our results.     

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.     

不完全资本市场、预防性储蓄与通货膨胀的福利成本分析

本文假设不完全资本市场条件下个体的自我保险为持币的主要动机,在总体风险和个体风险的框架下,讨论了通货膨胀对异质个体福利的影响。研究表明:对于像中国这样一个有很强信贷约束的不完全资本市场国家,本方法比传统基于MIU和CIA的模型更能反映通货膨胀对中国居民福利的影响。传统的方法低估了对像中国这样的国家中个体的通货膨胀福利成本。此外研究还表明,平均失业期对个体造成的通货膨胀成本影响很大。那些没有储蓄计划个体的出现减少了所有个体的平均福利。通过对总体风险的讨论,我们发现较高的失业率(平均失业期)将大大增加通货膨胀的成本,而工作分享计划则是一种降低通货膨胀成本的好措施。     

MIGRATION,MEDICAL AID AND WELFARE*

This paper constructs a simple rural‐urban migration model that explicitly incorporates the interactions between the individual's migration decision, the risk of incurring an infectious disease and unemployment. We show that providing a subsidy for health investment in urban regions in the form of medical aid does not improve individual welfare. This is because it induces further urban migration, increases the risk of infection and unemployment, and offsets completely the positive cost‐reduction effect.     

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.     

IMMIGRATION AND NATIVE WELFARE*

This article unifies two approaches for identifying the welfare and wage effects of immigration, one emphasizing the immigration surplus, the other stressing a potential welfare loss due to a terms‐of‐trade effect. We decompose the native welfare effect into a standard complementarity effect, augmented by a Stolper–Samuelson effect, and a terms‐of‐trade effect. We illustrate the welfare and wage effects of endogenous goods prices in a stylized‐specific factors model. Finally, we calibrate this model to a generic OECD economy and provide simulation results. The key insight is that endogenous goods prices play a quantitatively important role, sometimes even overturning received results.     

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.     

ON THE SOURCES OF THE INFLATION BIAS AND OUTPUT VARIABILITY

Why do dynamic inconsistencies in monetary policy exist? In this paper, a traditional model with output inefficiencies is introduced, but monetary policy is allowed to be influenced by the various constituencies in the economy that pressure Congress in turn to pressure the Central Bank to adopt a particular policy stance. This paper shows that in this economy an inflation bias arises because of the lobbying pressures of outsiders. Furthermore, it shows that if lobbying pressures are high enough, an inflation bias cannot be avoided for any finite level of Central Bank independence. It also shows that introducing the realistic feature of lobbying pressures has an impact on the stabilization properties of monetary policy. When a supply shock occurs, the shock is totally absorbed by a non‐myopic trade union, which has no lobbying costs. This is independent of any finite degree of conservativeness of the central banker, who has to accept an extreme increase in price instability. It is shown that monetary policy delegation is therefore sub‐optimal in achieving price stability compared with labor‐market reforms meant to remove monopsonistic elements. However, the same structural policies will induce greater output instability by strengthening the power of conservative central bankers.