2004年-世界发展银行全球_Gainers_and_Losers_from_Trade____________Reform_in_Morocco_42页_720kb

Summary of "Gainers and Losers from Trade Reform in Morocco"

Core Content

This paper by Martin Ravallion and Michael Lokshin analyzes the short-term welfare impacts of cereal trade reform in Morocco using micro-level data from the National Living Standards Survey (ENNVM) of 1998/99. The study focuses on distributional effects of removing import tariffs on cereals, which are the country's main food staple, and evaluates how different groups — particularly the rural poor — are affected.

Main Findings

• Aggregate Impacts: The overall welfare impacts of trade reform are small, with mean consumption and inequality showing only minor changes.
• Winners and Losers: The reform leads to both winners and losers, contradicting earlier claims that rural poor would benefit.
• Rural Poor Are Worse Off: On average, rural poor are negatively affected by cereal de-protection, even though they are typically assumed to be net consumers of cereals.
• Vertical vs. Horizontal Components:
  • The vertical component refers to how welfare impacts vary with pre-reform income levels.
  • The horizontal component refers to the variation in impacts among households with similar pre-reform welfare levels.
  • The horizontal component dominates the vertical impact, especially under full de-protection (Policy 4), indicating that within similar income groups, there are large disparities in how the reform affects welfare.

Key Methodology

• The study uses a computable general equilibrium (CGE) model to predict price changes from different trade reform scenarios.
• It applies micro data from the ENNVM to estimate welfare impacts at the household level.
• The welfare gain is calculated using a first-order approximation of the change in utility, based on the indirect utility function and household budget constraints.
• A non-parametric regression model is used to estimate the conditional mean impact of the reform, allowing for heterogeneity in household characteristics and regional differences.

Data and Scenarios

• The ENNVM survey includes 5,117 households, of which 2,154 are rural, and spans 14 out of 16 regions in Morocco.
• Four trade reform scenarios are simulated, with varying tariff reductions (10%, 30%, 50%, and 100%).
• The largest price changes occur in cereals, with spillover effects on other goods, some of which are compensatory.

Poverty and Inequality Impacts

• Poverty Increase: Complete de-protection (Policy 4) leads to a 2% increase in the national poverty rate.
• Rural Poverty Impact: The reform has a more significant effect on rural poverty, with the poorest 15% of rural households experiencing a 10% loss in consumption.
• Inequality Increase: The Gini coefficient increases slightly from 0.385 to 0.395 under full de-protection.
• Regional Disparities: The rural poor in Tanger-Tetouan, Fes-Boulemane, and Chaouia-Ouardigha experience the largest losses. In contrast, urban areas see small net gains, especially in Tanger-Tetouan.

Heterogeneity in Impacts

• Consumption Patterns: Rural households have higher budget shares for cereals compared to urban ones.
• Welfare Gains and Losses: There is significant variation in impacts, particularly among the poorest and richest households.
• Production vs. Consumption: The largest welfare losses are due to production effects, not just consumption changes.
• Compensatory Gains: While urban consumers may benefit from lower cereal prices, rural poor do not see significant compensatory gains, indicating unequal distribution of benefits and losses.

Policy Implications

• The study highlights the importance of social protection policies in mitigating the adverse effects of trade liberalization on vulnerable groups.
• It suggests that policy discussions should consider both vertical and horizontal components of inequality, not just the overall effect.
• The horizontal component is more relevant for understanding distributional impacts and should be emphasized in future policy analysis.

Conclusion

The paper concludes that trade reform in Morocco has mixed effects on welfare, with rural poor being disproportionately affected negatively. The horizontal dispersion in impacts is more significant than the vertical, indicating that within income groups, there are large differences in how the reform affects households. These findings have important implications for targeted social protection policies and equity considerations in trade liberalization.