2005年-世界发展银行全球_Has_NAFTA_Increased_Labor_Market____________Integration_between_the_United_States_and_Mexico__24页_449kb

Summary of "Has NAFTA Increased Labor Market Integration between the United States and Mexico?"

Core Content

This article examines whether the North American Free Trade Agreement (NAFTA) has increased labor market integration between the United States and Mexico, using three key criteria:

1. Responsiveness of Mexican wages to US wage shocks
2. Speed of convergence to the long-run wage differential
3. Rate of convergence of absolute wages

The study uses household survey data from the Mexican National Survey of Urban Employment (ENEU) and the US Current Population Survey (CPS) to analyze wage dynamics over the period 1987–2002. It builds on previous work by Robertson (2000) and extends the analysis to include the effects of trade, foreign direct investment (FDI), and migration on labor market integration.

Main Views

1. NAFTA and Labor Market Integration

• NAFTA was expected to enhance labor market integration through increased trade and FDI.
• However, the results are mixed, suggesting that while there is some evidence of increased integration, the effects are small and not statistically significant in many cases.
• The persistence of wage gaps between the US and Mexico raises questions about the extent of integration.

2. Trade and FDI

• Trade and FDI have positively contributed to labor market integration.
• The growth in these areas since NAFTA has been substantial, and they are expected to influence wage convergence.
• The model predicts that trade and FDI reduce the wage gap, but this effect may be masked by other factors.

3. Migration and Border Enforcement

• Migration is a key factor in labor market integration, but it is difficult to measure due to its illegal nature.
• Border enforcement is used as a proxy for migration and is found to have a negative effect on Mexican wages, potentially counteracting the positive effects of trade and FDI.
• Increased border enforcement may have shifted migration patterns, leading to localized wage effects and reduced responsiveness of wages to US shocks.

4. Regional Differences

• The border cities (Tijuana, Ciudad Juarez, Matamoros, Nuevo Laredo) are more integrated than Central Mexico.
• The maquiladora sector is used as a proxy for FDI, and it is associated with higher levels of labor market integration.
• Tijuana and Ciudad Juarez, which have high migration and maquiladora activity, show greater convergence to the equilibrium wage differential.

5. Wage Convergence and Shock Response

• The response of Mexican wages to US shocks is less significant after NAFTA, suggesting reduced integration.
• The rate of convergence to the long-run differential is higher in border cities but not significantly different from pre-NAFTA levels in the pooled sample.
• The effect of NAFTA on convergence is ambiguous, with mixed evidence of increased integration.

Key Findings

• Trade and FDI have contributed positively to labor market integration, but their effects are not clearly detectable in the post-NAFTA period.
• Increased border enforcement has had a negative impact on Mexican wages, possibly masking the positive effects of trade and investment.
• Wage convergence is weaker for less-educated workers, indicating that integration may be uneven across labor types.
• The pooled sample shows some evidence of faster wage convergence post-NAFTA, but more educated workers show slower convergence.
• The effects of NAFTA on wage shocks and convergence are not uniformly significant, suggesting limited or no overall integration.

Methodology

• The study uses a dynamic model of labor supply and demand to estimate wage shocks and convergence.
• A pseudo-panel approach is used to track wage changes over time for matched age-education cohorts in Mexico and the US.
• Regression models include variables such as trade, FDI, migration, and controls for the 1994 peso crisis.
• The effects of NAFTA are tested using a dummy variable and interaction terms with the shock and convergence terms.

Conclusion

• While trade and FDI may have positively influenced labor market integration, the overall evidence is mixed.
• The increase in border enforcement appears to have counteracted the integration effects, particularly for Mexican wages.
• The long-term wage gap has not closed significantly, and integration may have even decreased in some cases.
• The study highlights the complex interplay between trade, investment, and migration in shaping labor market integration, with border enforcement playing a critical role in determining wage outcomes.