2006年-世界发展银行全球_Trade_Preferences_to_Small_Developing_Countries_and_the_Welfare_Costs_of_Lost_Multilateral_Liberalization_24页_190kb

Summary of "Trade Preferences to Small Developing Countries and the Welfare Costs of Lost Multilateral Liberalization"

Core Content

This paper by Nuno Limão and Marcelo Olarreaga analyzes the impact of preferential trade liberalization on multilateral trade liberalization (MTL) and quantifies the welfare costs associated with this "stumbling block" effect. The study focuses on the trade preferences provided by the triad economies (European Union, Japan, and the United States) to least developed countries (LDCs) and evaluates the economic consequences of switching from unilateral preferences to fixed import subsidies.

Main Arguments and Key Findings

1. Stumbling Block Effect

• Preferential trade agreements (PTAs) can act as a barrier to MTL because they are used by developed countries to secure cooperation on non-trade issues.
• These preferences reduce the incentive for developed countries to lower MFN tariffs, as doing so would erode the preferential margin and thus the side payments they can extract.

2. Import Subsidy as a Solution

• Replacing unilateral preferences with a fixed import subsidy can eliminate the stumbling block effect.
• This substitution allows for a Pareto improvement, as it maintains the same level of support for LDCs while enabling further MTL.

3. Welfare Gains from Switching to Subsidies

• Switching from preferences to subsidies could lead to significant welfare gains.
• Annual net welfare gain for the 170 countries is estimated at $4,354 million, which adds about 10% to the gains from MTL in the Doha Round.
• Triad economies (EU, Japan, U.S.) would gain $2,934 million annually.
• Least developed countries would gain $520 million annually.
• Rest of the world would gain $900 million annually.
• The maximum gain for LDCs is 6.7% of GDP, while the average is 0.38%.

4. Welfare Cost of Preferences

• The welfare cost of preferences is calculated as the difference between the gains from MTL with and without preferences.
• The stumbling block factor is estimated at 0.8, based on the reduced MFN tariff cuts in the presence of preferences.
• The additional liberalization from switching to subsidies is estimated at 8.3 percentage points for goods subject to preferences, leading to greater welfare gains.

5. Empirical Evidence and Methodology

• The study uses tariff data for 170 countries and over 5,000 products to estimate the welfare effects.
• A partial equilibrium model is used, assuming that each tariff line represents a homogeneous good and that world markets are in equilibrium.
• The model does not incorporate cross-price effects or income effects, as they are considered to have little impact on aggregate welfare gains.

Key Information

• Preferences as a barrier to MTL were a major concern during the Uruguay Round and remain relevant in the Doha Round.
• The Generalized System of Preferences (GSP) is the primary mechanism through which developed countries provide preferential access to LDCs.
• The stumbling block factor is a critical measure in the analysis, indicating how much MTL is hindered by preferences.
• The switch to import subsidies would allow for greater MFN tariff reductions and thus more trade liberalization.
• The welfare gains are distributed unevenly, with LDCs and the rest of the world gaining more than the triad economies in relative terms.
• The maximum gain for LDCs is 6.7% of GDP, while the average gain is 0.38%.
• The stumbling block effect could cost an estimated $47 billion if the Doha Round were to fail due to preference erosion concerns.

Conclusion

The paper concludes that preferential trade liberalization, particularly for LDCs, can impede broader multilateral trade liberalization. By switching to an import subsidy model, the triad economies can achieve greater welfare gains while still supporting LDCs. The results suggest that the welfare cost of preferences is significant, and that the stumbling block effect is real and measurable. The proposed subsidy model offers a practical and effective alternative to current preference schemes, with potential for substantial benefits across all trading partners.

Table Highlights

• Table 1: Shows the budgetary impact of switching to a subsidy scheme for the triad economies, with costs under current and post-Doha scenarios.
• Table 2: Provides detailed welfare estimates, including GDP shares and annual gains for different groups, under three scenarios (intermediate, low, and high).

References and Context

• The IMF has expressed concern about the impact of preference erosion on LDCs and has proposed development assistance programs to address this.
• The WTO's MFN principle is central to the analysis, as it represents the core of multilateral trade liberalization.
• The stumbling block effect has been studied extensively in theoretical and empirical literature, but this paper is the first to quantify the welfare cost of this effect.

Implementation Considerations

• The import subsidy model is simple and effective, as it avoids the political and economic resistance associated with preference erosion.
• Rules of origin and predictability are key issues for improving the effectiveness of preferences, and similar considerations apply to the subsidy model.
• The utilization rate of current preferences is low, suggesting that the subsidy model may also not be fully utilized, but the net welfare gain remains significant.

Overall Impact

• The switch from unilateral preferences to import subsidies would enhance multilateral trade liberalization.
• The net welfare gain for the 170 countries is $4,354 million annually, which is 10% higher than the gains from MTL alone.
• The results are robust across different scenarios, indicating the potential for substantial benefits from reforming the current preference system.