Skilled-Labor Intensity Differences Across Firms,Endogenous Product Quality,and Wage Inequality

This paper proposes a theory to explain the relative wage-rate increase for skilled labor that results from trade liberalization that relies on within-sector reallocations of production resources (skilled and unskilled labor) across firms. Motivated by some stylized facts, in a model with firm heterogeneity, including firms that differ in their skill intensity even within a narrowly defined industry, firms with relatively high skill intensity that are more likely to be exporters, and a positive association between a firm’s skill intensity and its product quality, I develop a general equilibrium model where firms with a higher skill intensity endogenously choose a higher-quality product, and tend to be more profitable. In this framework, a reduction in trade costs allows members of the workforce to reallocate to more efficient firms that produce higher-quality products, using their skilled labor more intensively, resulting in a rising skill premium. The main sources of the increasing wage inequality that followed trade openness are a positive link between a firm’s skill intensity, its product quality, and quality competition.     

Global value chains,firms, and wage inequality: Evidence from China

How does participating or moving to more upstream in the global value chains (GVCs) affect the premium paid to skilled compared to unskilled labor within firms? In this paper, we develop a model of heterogeneous firms with intermediate trade and two skill inputs, in which we apply the fair wage hypothesis to predict the wage premium changes according to firms' GVCs activities. The model predicts that firms' backward GVC participation, as measured by the share of foreign value-added content in exports (FVAR), has an ambiguous impact on wage inequality of skills, which depends on the relative importance of “FVAR-labor substitution effect” and “FVAR-profit effect.” However, moving to upstream sectors in GVCs, as measured by the export varieties' upstreamness (or average distance from final use), raises a firm's wage premium. Using detailed Chinese firm-level data from 2000 to 2006, we develop a Mincer-type empirical model to study the wage premium changes associated with FVAR and upstreamness. We find robust empirical evidence that the rise of wage inequality in China mainly arises from moving to more upstream sectors rather than changing GVC participation.     

Wage Differentials in Taiwanese Manufacturing, 1982–1997

The present paper examines the impacts of technological change and trade flows on wage inequality across manufacturing industries. Using micro–level data from the Taiwan Manpower Utilization Survey (TMUS), 1982–1997, a slight decline in the log–wage differential between college and high–school workers is detected during this period. These results indicate that the accelerated growth in the relative supply of college graduates, combined with steady demand growth in favor of more highly educated workers, can largely explain the narrowing wage differentials within Taiwanese manufacturing over the period 1982–1997. In terms of demand–side factors, this study concludes that technology and trade are the two major forces driving the differences in wage inequality across industries.     

To upgrade or to relocate? Explaining heterogeneous responses of Chinese light manufacturing firms to rising labor costs

This paper studies the heterogeneous responses of Chinese light manufacturing firms to rising labor costs from the perspective of New Structural Economics. Using the first-hand pilot survey data, we find that rising labor costs have been the number one challenge facing firms, and that despite the dominant strategy of technological upgrading, there is a substantial difference in responses across different firms. In addition, we discover that industrial and firm-specific labor intensity are key determinants of the heterogeneous strategies across firms in response to rising labor costs. We conclude that intrinsically more labor-intensive industries and firms are more likely to choose relocation instead of upgrading as a strategy to cope with the rising labor costs.     

Trade liberalization and wage inequality: Evidence from Korea

This paper investigates the heterogeneous income distribution effects of trade liberalization using Korean survey data from years of 2000–2015. Following the Stolper-Samuelson theorem most of previous research studying the effects of trade liberalization on wage differences focus on workers’ characteristics (e.g., skilled or unskilled) while heterogeneity within the same worker group has not been yet substantially investigated. To fill this gap, this paper provides empirical evidence of wage inequality across firms within the same group of workers caused by trade liberalization, potentially implied in the new-new trade models with firm heterogeneity. Employing a difference-in-differences (DID) specification, we find that the wages of unskilled workers in Korea have increased since its FTAs with more advanced countries, such as members of EU and the US, came into effect, while the effects on the wages of skilled workers are negative but not statistically significant. We also show that wage effects are heterogeneous across firms within unskilled and skilled worker groups, while the positive effects are statistically significant and largest for unskilled workers in medium-large sized firms. These findings are in line with both traditional and new-new trade models.     

Appropriation,firm dynamics,and wage inequality

This paper examines the income distribution and welfare effects of appropriation activities in an economy. In the short run, with a given number of firms, appropriation can narrow wage inequality between skilled and unskilled labor when the capital resources accrued by appropriators are not large. However, wage inequality widens when the capital accrued is large. In the long run, with free entry and exit of firms, an increase in appropriation can cause firms to enter when the accrued capital is not large. This gives rise to a win–win outcome by raising the wages of skilled and unskilled labor. However, if accrued capital is large, firms exit and a lose–lose situation may occur in which skilled and unskilled wages are reduced.     

Trade,technology, and the labour market: impacts on wage inequality within countries

This paper focuses on the widening wage inequality between skilled and unskilled workers within countries and discusses whether trade and technology have contributed to this trend. The paper develops an analytical framework for wage inequality that traces the determinants and their relative roles in wage inequality in different stages of the development of trade theory, especially those considering new evidence after 2011. We find that technology plays a key role in the rise of wage inequality in most countries, while trade plays an increasingly crucial and more complex role in recent years. Skill supply institutions, such as education systems supplying skilled labour or unions participating in wage‐setting processes, suppress the rise of wage inequality in some countries. The paper further outlines the mechanisms through which trade affects wage inequality, including offshoring, firm heterogeneity, labour market frictions and global value chains. We find that trade has indirect effects on technology, which further enlarges the wage inequality among skills. The paper also discusses the policy implications of the impacts of trade and technology on wage inequality.     

贸易开放与工资差距——基于中国制造业行业面板数据的实证研究

本文在中国贸易非均衡发展现状基础上,构建计量模型,从商品价格机制、技术进步机制和生产率进步机制角度探讨中国贸易开放影响中国制造业行业间工资差距的具体传导机制。研究发现:(1)就制造业总体而言,贸易主要通过技术进步机制和劳动生产率机制来影响行业工资,造成行业间工资差距的扩大。(2)具体而言,劳动力密集型行业中,进出口贸易、资本密集度和劳动生产率共同作用于行业工资差距;在资本密集型行业中,进口贸易、资本密集度和劳动生产率是扩大工资差距的动因;在技术密集型行业中,出口贸易是工资差距扩大的主导因素。     

Wage inequality dynamics and trade exposure in South Korea

South Korea has experienced a great U-turn in its inequality trends during the past few decades. In this paper, we explore the role of international trade in its wage inequality dynamics over the 1998–2012 period, using a unique household panel survey. Our analysis reveals that most of the overall wage inequality occurs within sectors and educational groups rather than between them. However, the share in total inequality of the “between” variation across sectors and educational groups has moderately increased over time. Furthermore, we document that almost the entire aggregate wage inequality in both manufacturing and services occurs within different trade-exposure categories rather than between them, and this pattern is persistent through time. These results suggest that international trade might not be the main driving force behind the rising wage dispersion in South Korea in the last two decades.     

International trade and within-sector wage inequality: The case of South Korea

This paper studies which factors contributed to the changes in wage inequality in Korean manufacturing over the last three decades. By adopting Akerman et al. (2013)’s decomposition method, we examine the relative importance of within-sector and between-sector wage variations in Korean manufacturing over the period of 1980–2012. Our analytic results confirm that within-sector wage variation explains the lion’s share of overall wage inequality. Taking this finding into account, we estimate the impacts of international trade, skilled-biased technological change and labor market conditions on within-sector wage inequality in Korea. Our estimation results suggest that there was a structural change in determinants of wage inequality before and after the mid-1990s. The influence of international trade mainly through heightened import competition on wage dispersion became relatively more conspicuous over the last two decades.     

Free Trade and Wage Inequality in an Advanced Economy

This paper develops a formal model for examining the impact of free trade on the wage inequality in the Northern economy and the sensitivity of wage inequality indices to changes in causal factors within a general equilibrium setting.The model has three types of labor: sector-specific high-skilled, mobile unskilled and immobile unskilled labor. Thus, three types of wage inequality indices are derived. Selected comparative statics for changes in consumer expenditure shares, biased technological changes, changes in relative endowments are provided.     

Export Activity,Firm Size and Wage Structure: Evidence from Taiwanese Manufacturing Firms*

This study adopts a semiparametric smooth coefficient model to evaluate the export–wage premiums, firm size–wage premiums, and the wage gap between skilled and unskilled labor. Particular focus is placed upon widespread evidence indicating that pay levels in ‘large’ and ‘export‐oriented’ firms are higher than in their ‘small’ and ‘domestic‐oriented’ counterparts. Applying the firm‐level data for Taiwanese manufacturing firms, we find a positive export–wage premium for skilled workers and a negative export–wage premium for unskilled workers. The hypothesis of a constant export premium across firm size is rejected. While most of the export–wage premiums for skilled labor can be attributed to the small and medium firms, the large exporting firms have a significant adverse effect on wages for unskilled labor. Moreover, our results suggest that the firm size–wage premiums for skilled workers are larger than those for unskilled workers. The wage gap between the two skill groups is also sensitive to size categories.     

Multinationals, skills, and wage elasticities

The increase in foreign direct investments raises concerns about labor market consequences in many countries. It is feared that multinational firms are inclined to shift jobs abroad and increase job volatility. We use firm-level data to examine if multinationality and foreign ownership affect the wage elasticity of labor demand. Unlike previous studies, we distinguish the effect on different skill groups of employees. We find no general difference in wage elasticity between foreign and domestic firms but the wage elasticity is higher in multinational firms than in national firms, in particular for medium-skilled workers.     

Do Exporting Firms Pay Higher Wages? Evidence from Kenya's Manufacturing Sector

Abstract: When trade liberalization was first embarked on in Kenya some 20 years ago, a key argument against it was that it would reduce domestic wages, as exporting firms sought to remain competitive versus, for example, the low‐cost Asian countries. A counter argument was that manufactured exports require more elaborate design, supervision, packaging and handling, and thus a more educated labor force than production for the domestic market. To attract such skills, exporting firms would need to pay higher wages than non‐exporting ones. This paper uses data from Kenyan manufacturing to study the impact of trade liberalization on earnings, distinguishing between exporting and non‐exporting firms. In particular, it investigates whether exporting firms paid a wage‐premium to their employees. The study uses manufacturing firm survey data from a World Bank regional project. The study has three important findings: (1) There was a large and significant effect of exporting on wages in the first decade of trade liberalization. During the first half of the 1990s, workers in exporting firms earned up to 30 percent more than those engaged in non‐exporting firms. The results are robust even after controlling for individual and firm‐level characteristics such as employee demographics, productivity, firm location and occupation. (2) After a decade of trade liberalization, exporting ceased to be a significant determinant of wages in Kenyan manufacturing, after controlling for productivity and firm location. (3) During the 2000s, casual or irregular employment became a more common feature of exporting firms. The results suggest that while higher wages were important in attracting skilled labor to exporting firms at the beginning of trade liberalization in the 1990s, domestic competition has since reduced the wage premium. Cost cutting pressures are instead reflected in the substitution of casual and low wage labor for permanent and better educated labor and in increased automation.     

Foreign direct investment, intellectual property rights, and wage inequality in China

This article incorporates foreign direct investment (FDI) and product differentiation in a general equilibrium trade model. The analysis shows that freer trade and FDI will upgrade China's technology, improve its skills of labor, and increase the competitiveness of local firms in the international market. At the same time, the relative wage of skilled labor to unskilled labor will rise. The size of this rise will be affected by the degree of protection for intellectual property rights. These theoretical results are consistent with empirical evidence. The analysis provides insights in coordinating policies on FDI, labor market reform, and intellectual property rights protection.     

Do firms' political connections depress the union wage effect? Evidence from China

Our paper reconciles the debated literature on the role of the Chinese unions by exploring the heterogeneous effects of unionization on wages in firms with and without political connections. We utilize a survey of 1268 firms in 12 cities to verify our hypothesis that wages increase due to unionization, but this union wage effect is significantly depressed by firms' political connections. Through a detailed analysis of the mechanism behind the empirical results, we conclude that unions increase workers' wages by strengthening the bargaining power of workers, while this bargaining power can be weakened by firms' political connections. Our main conclusion is robust to a series of robustness checks. Moreover, the results from quantile regressions inform us that the union wage effect and the role of political connections may vary along with the firms' wage distribution. Our findings suggest that the solution to further increase wages for low-wage workers and reduce wage inequality is to make the labor union an independent organization which can freely bargain with firms in terms of workers' wages and benefits, rather than an agency subordinate to the government whose role can be affected by the government support and undermined largely by firms' political connections.     

Exports and labor costs: evidence from a French policy

We investigate the role that labor costs hold in exporters’ performance. To do so, we exploit a large-scale French reform that granted most firms a tax credit proportional to the wagebill of their employees paid below a given threshold. This policy effectively translated into a cut in labor cost whose magnitude varies depending on firm-specific wage structures. We use the predicted treatment intensity based on pre-reform composition of the labor force as an instrument for the actual policy-induced firm-level change in labor costs. Although our point estimates are consistent with commonly estimated firm-level trade elasticities combined with reasonable labor shares in total costs, coefficients are found to be very noisy, suggesting lack of robust evidence of a causal effect of the policy. We discuss several potential explanations for our results as well as their implications.     

比较优势、规模经济和贸易成本:国际生产分割下垂直关联产业的空间分布

在国际生产分工背景下,比较优势和规模经济成为影响企业生产区位的重要因素。本文在新经济地理框架下构建开放条件下理论模型,探讨不同贸易成本下比较优势和规模经济对垂直关联产业空间分布的影响。结果刻画出在比较优势和规模经济共同作用下,伴随贸易成本变化出现的4种垂直关联产业空间分布模式。表明我国目前所处的国际分工地位是在现有贸易成本条件下比较优势和规模经济相互作用的均衡结果,而吸引上游产业在中国聚集是实现我国产业结构升级的合理路径。     

技术革新、产业层级分工与工资差异

本文在一般均衡的框架中,运用匹配与分类的思想,综合考虑了技术变革所引起的沟通成本的降低和技术进步对劳动力技能产生的“技能贬值”效应,将技术进步、产业组织结构变化与工资差距三者相结合建立模型。该模型能够将产业组织架构内生化,对不同能力的员工进行生产职能分配,并能给出技术变革与工资水平差距的内在联系;同时,本文利用珠三角的经济发展事实对以上模型结论提供了经验证据。     

Heterogeneous workers and international trade

In this paper, I survey the recent theoretical literature that incorporates heterogeneous labor into models of international trade. The models with heterogeneous labor have been used to study how talent dispersion can be a source of comparative advantage, how the opening of trade affects the full distribution of wages, and how trade affects industry productivity and efficiency via its impact on sorting and matching in the labor market. Some of the most recent contributions also introduce labor market frictions to study the effects of trade on structural unemployment and on mismatch between workers and firms.