关于开放条件下收入差距的理论探讨

随着近年来保护贸易的盛行与收入差距的持续扩大,对开放条件下收入不平等的研究成为国际经济学领域的热点.从开放的三种表现形式:商品/服务贸易、资本/劳动力的跨国流动以及技术的传播等角度入手,并结合制度因素,对有关开放与收入差距关系的研究做一回顾.综合来看,无论何种影响机制,最终渠道都是通过提高或降低对技术劳动的需求来影响收入差距,这与传统理论一脉相承.相关研究在放松原有理论假设条件的基础上,将分析角度从宏观转入微观,更侧重于从产业和公司层面对比研究.绝大部分理论认为开放可能导致收入差距扩大而不是降低它们,如何制定适当的国内再分配政策调节收入差距将是今后研究的侧重点.     

Immigration and domestic wage: an empirical study on competition among immigrants

While studies on the wage effects of immigration focus on native workers, there is significantly less information on the wage effects of immigration on domestic foreign-born workers. In addition to analysing the impact of immigration on wages of native workers, in this article, we estimate the internal competition among foreign-born workers in the United States. Firstly, using data from the Current Population Survey, we find no empirical evidence supporting the substitutability of native workers for immigrants. Secondly, there is no statistical difference between skilled and unskilled immigrants on the influence of the domestic labour market outcomes. Finally, there is no internal competition among immigrants. The income of non-citizen workers mainly depends on state and national levels of economic situations, not the number of non-citizen workers available in the labour market.     

Skill premium in Portuguese manufacturing industries

The debate between the skill-biased technological change (SBTC) approach and the international trade (IT) explanation to obtain the best explanation for the wage gap between skilled and unskilled workers continues. In this article, we divide the Portuguese manufacturing industries into high-tech and low-tech and study the approach that best justifies the wage gap, for the period between 2007 and 2014. The results point out that the SBTC approach is the main explanation to the formation the wage gap between the labour force with tertiary education (skilled) and with secondary and primary education (unskilled).     

Another Nail in the Coffin? Or Can the Trade Based Explanation of Changing Skill Structures Be Resurrected?

The skill structure of wages and employment has altered markedly in recent years. In some countries (most notably the UK and the US) wage inequality has risen sharply and in most countries relative demand has shifted unfavourably against the less skilled. In this paper we reassess the evidence that rising international competition from developing countries is the crucial factor underpinning these changes. Our results, based on newly constructed internationally comparable industry data, find little support for the predictions of the basic Heckscher-Ohlin (H-O) trade model.
JEL classification: J 31; F 14     

Endogenous information quality: A job-assignment application

This paper investigates the optimal acquisition of information in a model of job assignment within a firm. We consider a firm with two types of jobs, skilled and unskilled. The firm draws workers randomly from the general population, and a worker is either talented or untalented. Initially, a worker's productivity in the firm is unknown to the worker and the firm. Workers are equally productive in the unskilled job, but talented workers are more productive in the skilled job than in the unskilled job, and untalented workers are more productive in the unskilled job than in the skilled job. Before assigning a worker to a job, the firm can test whether the employee is talented, and the firm is able to choose the accuracy of this test. We assume that the cost of a test is increasing and convex in test accuracy. We show that (1) the accuracy of the firm's test increases with the cost of a mismatched worker; (2) increased optimism about the worker's ability need not lead to less rigorous testing; (3) the probability that a worker is assigned to the skilled job need not increase as the gain from assigning a talented worker to a skilled job increases, or the loss from assigning an untalented worker to a skilled job decreases, or the fraction of the population that is skilled increases; and (4) a longer testing period, allowing as many as two tests of workers, leads the firm to use a less expensive, and less accurate, test initially than when there is only one opportunity to gather information.     

劳动力异质性与中国最低工资标准就业效应分析

最低工资是当今世界各国广泛应用的经济政策,也是经济学家关心的议题。我国的最低工资标准偏低,且执行程度欠佳,所以我国的最低工资覆盖情况实际上符合部分覆盖的假设。同时由于我国劳动力的异质性以及最低工资制度的实施,导致未覆盖部门的低技能劳动力就业增多,而覆盖部门的高技能劳动力就业比例增多,总的就业效应方向并不明确。     

Patterns of technical change: a geometrical analysis using the wage–profit rate schedule

In this paper we examine some basic stylized facts of economic growth according to the modern restatement of the classical theory of income distribution. In particular, we make use of a wage–profit frontier in order to explore the patterns of technical change experienced by a set of 18 industrialized economies, during the last 40 years. Our main purpose is to document the evolution of technical change. Using empirical evidence from the Italian industry, we also make an attempt to provide an explanation to data from a classical perspective, alternative to the standard approach founded on the aggregate production function.     

Persistent income gaps in an occupational choice model with multi‐goods

In this study, we propose a theory to explain why income gaps persist. We model a simple overlapping‐generations economy with three consumption goods and two types of workers. We find that high‐skilled workers have comparative advantage in skill‐intensive jobs and low‐skilled workers in less skill‐intensive jobs. This pattern of comparative advantage determines occupational choices by workers. Combined with human capital accumulation, the occupational choices widen income gaps between families. At the same time, the relative price of skill‐intensive goods declines owing to productivity improvement. The decline holds back income gaps from exploding. The implications of skill‐biased technological change are also examined.     

产业内贸易对中国技能工资差距的影响

本文试图考察产业内贸易对技能工资差距的影响,理论分析表明：它随劳动力条件的变化而变化,在劳动力无限供给条件下它取决于技术劳动力的绝对需求,由于产业内贸易必能刺激技术劳动力的绝对需求,因此必然会扩大工资差距。但在劳动力条件转向有限供给后,它又取决于技术劳动力的相对需求,而产业内贸易未必使之扩大,特别是对两类劳动力替代弹性较大的部门来说,可能会使技术劳动力的相对需求下降,并使技能工资差距收缩。本文基于中国33个产业的5年面板数据验证了上述假说。     

Skilled and unskilled wage dynamics in Italy in the 1990s: changes in individual characteristics,institutions, trade and technology

In this paper, we use individual micro data on workers combined with industry and regional data to study the wage dynamics of skilled and unskilled workers in Italy in the 1991–1998 period. In contrast to previous empirical studies, our data make it possible to analyse, within a single framework, the role of many of the factors indicated in the literature as possible determinants of skilled and unskilled wage dynamics: changes in the individual characteristics of workers, changes in labour market institutions, increasing international integration, and skill‐biased technological progress. Our results show that international integration, both in terms of trade in goods and in terms of international labour mobility, plays a role in determining the wage dynamics of skilled (white‐collar) and unskilled (blue‐collar) workers. Moreover, in line with labour economics research, our findings show that the individual characteristics of workers and the institutional variables are more relevant in explaining skilled and unskilled wage dynamics than wage differentials.     

Elasticity of substitution and productivity, capital and skill intensity differences across firms

This paper, instrumented with six theorems, shows that differences between firms in labor productivity, capital intensity and relative demand for skilled labor can be explained by differences in the substitution parameters between capital, skilled and unskilled labor in the presence of skill biased technical change.     

"民工荒"与"技工荒"并存的理论解释及证据——基于投资结构与就业均衡视角的研究

"民工荒"与"技工荒"并存的情况已成为困扰中国劳动力市场健康发展的难题。文章从投资结构与就业均衡视角对此进行理论模型分析,研究发现,在资本约束条件下,技术改造型资本和外延扩大型资本的迅速扩张,导致技术和非技术劳动力需求量的急剧增长,工资刚性导致劳动力供给刚性,而人力资本投资不足则导致劳动力质量上升缓慢,因而劳动力市场中技术与非技术劳动力的供需矛盾造成了"民工荒"与"技工荒"的并存。研究表明,将技术改造型资本投入和外延扩大型资本投入保持与在职培训人力资本投资的均衡增长,那么将不会产生劳动力双重短缺,即有效解决"两荒"并存的难题。     

Analyzing skilled and unskilled labor efficiencies in the US

In this paper, I analyze the time paths of the efficiencies of skilled and unskilled labor in a production framework where skilled and unskilled labor are imperfect substitutes. Their implications for economic growth and wage inequality in the US between 1950 and 2005 present two main findings. First, although skilled labor efficiency has a strong upward trend, I find no evidence of acceleration in its growth rate to support the common view that there has been an acceleration in the new skilled-biased technologies. Second, beginning around 1970, there has been a decline in the absolute level of the efficiency of unskilled labor, implying that the decline has played a significant role in the overall productivity slowdown and the substantial widening in the US wage structure.