2005年-世界发展银行全球_Trade_Protection_and_Industry_Wage_Structure_in_Poland_39页_539kb

Summary of "Trade Protection and Industry Wage Structure in Poland"

Core Content

This study investigates the impact of trade liberalization on the industry wage structure in Poland during the period 1994–2001, a time of significant economic transition and preparation for EU accession. The analysis focuses on how changes in import tariffs affected wages, particularly for unskilled workers, and explores the underlying mechanisms that link trade policy to wage outcomes.

Main Views and Key Findings

• Trade Liberalization and Wages: The study finds that a decrease in industry tariffs was associated with higher wages for workers in those industries. This relationship is robust to the inclusion of year and industry fixed effects, as well as controls for industry-level exports, imports, concentration, capital accumulation, and foreign direct investment (FDI).

• Unskilled Workers Benefit: The results hold even when skilled workers are excluded from the sample, indicating that trade liberalization had a positive effect on unskilled labor wages. This suggests that the reduction in trade barriers did not lead to a "race to the bottom" but instead benefited unskilled workers.

• Industry Composition and Tariff Reductions: Industries with a higher proportion of unskilled labor experienced more significant tariff reductions. For example, the leather manufacturing sector saw a 23 percentage point reduction in tariffs, while the machinery industry had a smaller reduction of 8 percentage points. This aligns with the observed wage increases in sectors with a higher share of unskilled labor.

• Productivity and Competitive Pressures: The findings are consistent with the idea that trade liberalization increases competitive pressures on firms, leading to restructuring and productivity improvements. These gains are then shared with workers, resulting in higher wages. The study also supports the hypothesis that reduced import costs from trade liberalization enhance firm profitability.

• Labor Market Rigidity: The rigid labor market in Poland, characterized by limited labor mobility and strict hiring and firing regulations, made the industry affiliation of workers a key channel through which trade liberalization affected wages.

• Exogenous Tariff Changes: The tariff reductions in Poland were predetermined by the Association Agreement with the European Community, allowing the researchers to treat them as exogenous. This strengthens the causal interpretation of the results.

• Sectoral Changes and Unionization: The economic restructuring during the period led to a decline in employment in agriculture and mining, and a rise in the services sector. Unionization also declined due to privatization and the shift to smaller enterprises, reducing their influence on wage outcomes.

Methodology and Data

• Data Source: The study uses data from the Polish Labor Force Surveys (LFS) conducted from 1994 to 2001. These surveys provide information on worker characteristics, employment status, and wages.

• Empirical Model: A reduced-form wage equation is estimated, where the logarithm of real hourly wages is the dependent variable. The model includes worker characteristics, geographic variables, year and industry fixed effects, and tariff variables.

• Tariff Data: Tariff data are sourced from the World Bank’s WITS database and are used to measure the impact of trade liberalization on wages. The analysis considers both tariffs on EU imports and world imports.

• Control Variables: The model includes control variables such as the Herfindahl Index (industry concentration), capital accumulation, FDI stock, and trade flows. These are used to isolate the effect of tariff changes on wages.

Descriptive Statistics

• Worker Demographics: The average age of workers increased from 56 in 1994 to 59 in 2000, but dropped sharply to 39 in 2001. The average hours of work remained stable at around 41 hours, with a slight decline in 2001.

• Education Trends: The proportion of workers with primary education or less decreased from 13.7% to 10.5%, while the share of tertiary-educated workers increased from 12% to 15%.

• Employment Trends: Private sector employment increased from 24% in 1994 to 49% in 2001, indicating a shift from state-owned to private enterprises.

• Industry Composition: The share of unskilled labor in most industries decreased over the period, with notable exceptions such as the paper and pulp manufacturing and social and communal services sectors. The correlation between the share of unskilled labor and tariff changes was -0.644, suggesting that industries with more unskilled workers faced greater tariff reductions.

Conclusion

The study concludes that trade liberalization in Poland had a positive effect on wages, particularly for unskilled workers. The results are consistent with increased firm productivity and competitive pressures resulting from reduced trade barriers. The findings provide insights into the broader implications of trade policy on income distribution and poverty, especially in transition economies with rigid labor markets and significant structural changes.

Key Information

• Time Period: 1994–2001
• Country: Poland
• Focus: Trade liberalization and its effect on industry wage structure
• Methodology: Mincerian wage equation with industry-specific tariff variables
• Sample: 14 manufacturing sectors and the electricity sector
• Robustness: Results are robust to inclusion of year and industry fixed effects, as well as controls for industry-level variables
• Policy Implication: Trade liberalization can lead to wage increases, especially for unskilled workers, and may not exacerbate wage inequality as previously feared

References to Supporting Literature

• Specific Factors Model: Predicts a positive association between protection and wages, which is partially supported by the study’s findings.
• Productivity Studies: Show that trade liberalization improves productivity, particularly in sectors exposed to international competition.
• Labor Market Flexibility: The study highlights the importance of labor market rigidity in determining the wage effects of trade policy.

Limitations and Notes

• The analysis is based on repeated cross-sections rather than a true panel dataset.
• The study does not consider the effects of trade liberalization on unemployment.
• The industry classification is aggregated, limiting the ability to investigate firm-level input costs in detail.