A nonparametric decomposition of the Mexican American average wage gap

This paper shows that average wage gap decompositions between any two groups of workers can be carried out using nonparametric wage structures. It also proposes an algorithm to correct for sample selection in nonparametric models known as tree structures. This paper studies the wage gap between third‐generation Mexican American and non‐Hispanic white workers in the southwest. It is shown that the decomposition heavily depends on functional assumptions, and that different aproaches to flexibility may render sufficiently good and similar results Copyright © 2008 John Wiley & Sons, Ltd.     

TRADE LIBERALIZATION,LABOR DEMAND SHIFTS AND EARNINGS INEQUALITY IN SINGAPORE

This article investigates the relative wage between skilled and low skilled labor in a small open economy with traditionally few labor market rigidities. It looks at the role of relative skills demand and supply in determining skills premium and explores the extent to which trade liberalization affects the skills wage gap. Indications are that greater openness is linked to higher labor demand elasticity and/or technological progress. The evidence also suggests that rapid acceleration in labor demand for skills and trade liberalization has widened the wage gap between skilled and low skilled labor. This result persists regardless of industry type.     

Identification issues in the public/private wage gap,with an application to Italy

This paper reviews some of the standard assumptions that are imposed in order to estimate the average public/private wage gap and that are mainly related to the possible selection of the sector. There are two contributions to the existing public/private wage gap literature. One is a better understanding of the identified parameters: standard estimators identify a local effect (LATE), which in general cannot be generalized to the entire population, as instead is almost always done. The other is the partial identification of the population average treatment effect, with an instrumental variable. To the best of my knowledge, this is the first paper in this literature that employs bounds. The technique is applied to male workers in Italy. For compliers, LATE estimates a wage advantage from working in the public sector greater than 30%. This return is within the narrowest bounds on the population average treatment effect that are consistent even with a much smaller gap (about 15% or more).     

Public–private wage gap in Latin America (1992–2007): A matching approach

Using matching methods, we estimate the public–private wage gap for urban workers in eleven Latin American countries for the 1992–2007 period. These methods do not require any estimation of earnings equations and hence no validity-out-of-the-support assumptions; furthermore, this approach allows us to estimate not only the average wage gap but also its distribution. Our main findings indicate that the average public sector worker earns more than his/her private counterpart, and that this differential increased over the 1992–2007 period. Important differences along the wage distribution are also shown in the results; in fact, public servants in the highest percentiles of the wage distribution generally earn less than their private sector equivalents. Nonetheless, the percentile at which a positive wage gap becomes a wage penalty shifted over the period as the average wage gap experienced by most countries widened. Still, the most qualified public sector workers do face a wage penalty. Furthermore, indicators of government effectiveness show no relationship with the country ranking according to the public–private wage gap.     

Gender wage gap: A semi-parametric approach with sample selection correction

Sizeable gender differences in employment rates are observed in many countries. Sample selection into the workforce might therefore be a relevant issue when estimating gender wage gaps. We propose a semi-parametric estimator of densities in the presence of covariates which incorporates sample selection. We describe a simulation algorithm to implement counterfactual comparisons of densities. The proposed methodology is used to investigate the gender wage gap in Italy. We find that, when sample selection is taken into account, the gender wage gap widens, especially at the bottom of the wage distribution.     

Explaining cross-racial differences in teenage labor force participation: Results from a two-sided matching model

White teenagers are substantially more likely to search for employment than black teenagers. This differential occurs despite the fact that, conditional on race, individuals from disadvantaged backgrounds are more likely to search. While the racial wage gap is small, the unemployment rate for black teenagers is substantially higher than that of white teenagers. We develop a two-sided search model where firms are partially able to search on demographics. Model estimates reveal that firms are more able to target their search on race than on age. Employment and wage outcome differences explain half of the racial gap in labor force participation rates.     

Gender gaps across the earnings distribution for full-time employees in Britain: Allowing for sample selection

This paper investigates gender differences across the log wage distributions of British employees working full-time in 2005. The raw gender wage gap shows a tendency to increase across the distribution with a glass ceiling effect indicated. A strong relationship between high skilled, white-collar occupations and carrying out managerial duties with the glass ceiling effect is indicated in the data. After allowing for positive selection into full-time employment by British women, a substantially larger gender earning gap is found: the selection corrected gender wage gap is close to twice the raw gap across most of the earnings distribution. This selection corrected gap is found to be predominantly related to women receiving lower rewards for their characteristics than men. Indeed, the results suggest the gender earnings gap would all but disappear across the earnings distribution if women working full-time received the same returns to their characteristics as men working full-time in Britain do.     

A Meta‐Analysis of the International Gender Wage Gap

Abstract.  Since the early 1970s, a number of authors have calculated gender wage differentials between women and men of equal productivity. This meta‐study provides a new quantitative review of this vast amount of empirical literature on gender wage differentials as it concerns not only differences in methodology, data, and time periods, but also different countries. We place particular emphasis on a proper consideration of the quality of the underlying study which is done by a weighting with quality indicators. The results show that data restrictions – i.e. the limitation of the analysis to new entrants, never‐marrieds, or one narrow occupation only – have the biggest impact on the resulting gender wage gap. Moreover, we are able to show what effect a misspecification of the underlying wage equation – like the frequent use of potential experience – has on the calculated gender wage gap. Over time, raw wage differentials worldwide have fallen substantially; however, most of this decrease is due to better labor market endowments of females.     

市场潜能加剧了性别工资不平等吗？

本文首先构造了我国338个城市包含海外和国内市场的总市场潜能指标,并利用2005年全国人口抽样调查数据和新经济地理学的基准工资方程,通过Heckman样本选择模型和RIF回归分解方法实证分析了市场潜能对性别工资不平等的影响。研究发现：市场潜能虽然对工资水平具有显著的正向拉动作用,并缩小了高技能劳动力的性别工资不平等,但扩大了低技能劳动力的性别工资不平等,从而加剧了整体的性别工资不平等,其中对低收入群体的加剧作用大于中高收入群体。RIF工资分解结果也证实了这一事实,且收入分布上半部分（90-50分位点）和工资结构效应对此贡献较大,尤其是市场潜能的工资结构效应贡献了总工资结构效应的60%以上,表明从城市间市场潜能及其对性别工资的影响入手,将是破解性别工资不平等难题的有效路径。     

A search interpretation of the family gap

This paper proposes a general equilibrium search model to investigate what is known as the family gap: wage differentials between mothers and non-mothers. In the human capital literature a substantial amount of the family gap is left unexplained after controlling for schooling and experience. This paper suggests that differences in labor market behavior between mothers and non-mothers are an important factor in explaining the family gap. For college graduates, estimation results show that employed mothers search 70% less than non-mothers and more than 50% of the family gap can be explained by the labor market behavior differences between mothers and non-mothers. Such differences, however, can not explain the family gap for high school graduates.     

Wage inequality, technology and trade: 21st century evidence

This paper describes and explains some of the principal trends in the wage and skill distribution in recent decades. Increases in wage inequality started in the US and UK at the end of the 1970s, but are now widespread. A good fraction of this inequality trend is due to technology-related increases in the demand for skilled workers outstripping the growth of their supply. Since the early 1990s, labor markets have become more polarized with jobs in the middle third of the wage distribution shrinking and those in the bottom and top third rising. I argue that this is because computerization complements the most skilled tasks, but substitutes for routine tasks performed by middle wage occupations such as clerks, leaving the demand for the lowest skilled service tasks largely unaffected. Finally, I argue that technology is partly endogenous, for example it has been spurred by trade with China. Thus, trade does matter for changes in the labor market, but through a different mechanism than conventionally thought.     

Counterfactual distributions with sample selection adjustments: Econometric theory and an application to the Netherlands

Several recent papers use the quantile regression decomposition method of Machado and Mata [Machado, J.A.F. and Mata, J. (2005). Counterfactual decomposition of changes in wage distributions using quantile regression, Journal of Applied Econometrics, 20, 445–65.] to analyze the gender gap across log wage distributions. In this paper, we prove that this procedure yields consistent and asymptotically normal estimates of the quantiles of the counterfactual distribution that it is designed to simulate. Since employment rates often differ substantially by gender, sample selection is potentially a serious issue for such studies. To address this issue, we extend the Machado–Mata technique to account for selection. We illustrate our approach to adjusting for sample selection by analyzing the gender log wage gap for full-time workers in the Netherlands.     

Verifiable wage offers and recontracting: effect on wage and consumption profiles

This paper analyzes the effect of recontracting and matching verifiable wage offers on the intertemporal structure of contract wage and consumption profile for a two-period economy. A contract firm provides specific training for a worker during the first period, which increases his productivity if he stays in the second period, but the worker may quit to accept an alternative wage offer after a successful search. Wage offers are private to the worker but can be presented to the contract firm for matching. This paper shows that when capital markets are imperfect and wage offers are verifiable, the contract firm recontracts and matches any wage offers the worker receives up to the second-period productivity. The ex ante contract wage profile will be flat. Inefficient quits will be eliminated and there will be complete ex ante consumption smoothing. It is significant to note that the result of rising wage profile derived in numerous contract models is fragile with respect to assumptions on mechanism of interfirm labor mobility.     

Analyzing the gender pay gap

Empirical research on gender pay gaps has traditionally focused on the role of gender-specific factors, particularly gender differences in qualifications and differences in the treatment of otherwise equally qualified male and female workers (i.e., labor market discrimination). This paper explores the determinants of the gender pay gap and argues for the importance of an additional factor, wage structure, the array of prices set for labor market skills and the rewards received for employment in favored sectors. Drawing on our previous work we illustrate the impact of wage structure by presenting empirical results analyzing its effect on international differences in the gender gap and trends over time in the gender differential in the U.S.     

The Gender Wage Gap in Europe: Job Preferences,Gender Convergence and Distributional Effects

The gender wage gap has declined over time. However, most of the remaining gap is unexplained, partly because of gender convergence in wage‐determining characteristics. In this paper, we show the degree of convergence differs substantially across Europe. In some countries, predominantly in Eastern Europe, the gender wage gap is entirely unexplained. However, in other countries, differences between the characteristics of men and women explain a relatively large proportion of the wage gap. Gender differences in job preferences contribute 10% to the wage gap, which is more than job tenure, previous employment status or field of study. The role of job preferences is particularly strong at the top of the wage distribution.     

Equal-treatment policy in a random search model with taste discrimination

We consider a search model of the labor market with two types of equally productive workers and two types of firms, discriminators and non-discriminators. Without policy intervention, there is wage dispersion between and within the two worker groups, but all wage differences become negligible when the taste for discrimination is small. We analyze the effect of an equal-pay policy, both in combination with affirmative action and without. When equal opportunity of hiring cannot be enforced, wage dispersion increases and wages for minority workers fall substantially relative to laissez faire. Sometimes also the wage gap between worker groups widens in response to the policy.     

Skill shortages and labor market outcomes in Central Europe

The new Central European members of the EU have been characterized by low employment rates, especially among unskilled workers, despite the GDP recoveries and large private sector shares in output and employment. Evidence points at skill shortages in Central Europe as a key impediment to faster labor reallocation and convergence to the EU-15 employment structures. In this paper, we develop a simple model of labor reallocation with transaction costs and show how skill shortages can inhibit firm creation and increase income inequality. We use the model to examine the impact of training subsidies and their financing on skill acquisition and start-ups of new private firms, and show that the positive effect of subsidies would be mostly offset by high wage taxes. Shifting financing from wage to consumption taxes would improve incentives for workers’ training and firm start-ups, while relying more on income taxes could reduce the income gap between workers and entrepreneurs.     

Rising wage inequality,the decline of collective bargaining,and the gender wage gap

This paper investigates the increase in wage inequality, the decline in collective bargaining, and the evolution of the gender wage gap in West Germany between 2001 and 2006. Based on detailed linked employer–employee data, we show that wage inequality is rising strongly — driven not only by real wage increases at the top of the wage distribution, but also by real wage losses below the median. Coverage by collective wage bargaining plummets by 16.5 (19.1) percentage points for male (female) employees. Despite these changes, the gender wage gap remains almost constant, with some small gains for women at the bottom and at the top of the wage distribution. A sequential decomposition analysis using quantile regression shows that all workplace related effects (firm effects and bargaining effects) and coefficients for personal characteristics contribute strongly to the rise in wage inequality. Among these, the firm coefficients effect dominates, which is almost exclusively driven by wage differences within and between different industries. Labor demand or firm wage policy related effects contribute to an increase in the gender wage gap. Personal characteristics tend to reduce wage inequality for both males and females, as well as the gender wage gap.     

The impact of minimum wages on wages,work and poverty in Nicaragua

In this paper we use an individual- and household-level panel data set to study the impact of changes in legal minimum wages on a host of labor market outcomes including: a) wages and employment, b) transitions of workers across jobs (in the covered and uncovered sectors) and employment status (unemployment and out of the labor force), and c) transitions into and out of poverty. We find that changes in the legal minimum wage affect only those workers whose initial wage (before the change in minimum wages) is close to the minimum. For example, increases in the legal minimum wage lead to significant increases in the wages and decreases in employment of private covered sector workers who have wages within 20% of the minimum wage before the change, but have no significant impact on wages in other parts of the distribution. The estimates from the employment transition equations suggest that the decrease in covered private sector employment is due to a combination of layoffs and reductions in hiring. Most workers who lose their jobs in the covered private sector as a result of higher legal minimum wages leave the labor force or go into unpaid family work; a smaller proportion find work in the public sector. We find no evidence that these workers become unemployed.Our analysis of the relationship between the minimum wage and household income finds: a) increases in legal minimum wages increase the probability that a poor worker's family will move out of poverty, and b) increases in legal minimum wages are more likely to reduce the incidence of poverty and improve the transition from poor to non-poor if they impact the head of the household rather than the non-head; this is because the head of the household is less likely than a non-head to lose his/her covered sector employment due to a minimum wage increase and because those heads that do lose covered sector employment are more likely to go to another paying job than are non-heads (who are more likely to go into unpaid family work or leave the labor force).     

工业机器人应用对城镇居民收入差距的影响

研究目标:实证研究工业机器人应用对城镇居民收入差距的影响,并对相关影响机制进行探讨。研究方法:运用双向固定效应模型、工具变量等方法进行因果推断。研究发现:工业机器人的应用显著拉大了城镇居民的收入差距,通过多种稳健性检验和内生性处理后,结论仍然成立。机制分析表明,工业机器人的应用通过对劳动力市场中不同群体就业机会和工资水平的异质性影响进而对整体的收入差距产生作用。此外,分样本回归发现,工业机器人引起的收入差距扩大作用更多地表现在低收入、低教育地区。研究创新:首次利用中国家庭追踪调查和工业机器人使用数据进行研究,并对相关机制进行深入探究。研究价值:从劳动力市场的角度进行分析并为政府决策提供参考。