2022-05-12-IMF-Bilateral_Trade_Imbalances_83页_2mb

Bilateral Trade Imbalances: Drivers and Implications

Introduction

• Key Question: What drives variations in bilateral trade balances across countries?
• Core Argument: Structural gravity models show that pairwise trade frictions (asymmetries in trade barriers) explain most of the observed variation in bilateral imbalances.

Methodology

1. Structural Gravity Model: Assumes sectoral trade flows follow a gravity equation.
2. Variance Decomposition: Analyzes data (2010-14) for 40 economies and the Rest of the World.
   • Terms: Macro trade balances, triangular trade ("triangular trade"), and bilateral asymmetries in trade frictions.
   • Findings: Macro balances explain ~2% of variation; triangular trade ~12%; asymmetries ~84%.
3. Dynamic Quantitative Trade Model: A many-country, many-sector model with calibration to match data.
   • Used counterfactuals (exact-hat algebra) to explore impacts of eliminating trade-wedge asymmetries.

Key Findings

• Gravity Equation: Bilateral trade imbalances arise from macro trade balances, sectoral expenditure differences ("triangular trade"), and asymmetric trade frictions.
• Asymmetry Dominance: Most variation in proportional bilateral imbalances (e.g., U.S. deficits with China) is due to residual trade frictions (85% from variance decomposition).
• Macroeconomic Impact: Eliminating all bilateral trade-cost asymmetries reduces proportional imbalances and boosts real GDP/consumption by ~11% for most countries.

Counterfactual Scenarios

Global Trade-Wedge Symmetry

• Scenario: All bilateral trade frictions become symmetric.
• Outcomes:
  • Reduces variation in proportional bilateral imbalances.
  • Minimal change in macro trade balances but substantial welfare gains (~11% increase in real GDP for median country).
  • Benefits countries like Mexico, South Korea, and Turkey the most (~38%, 20%, 19% GDP increases).

Extension of Single Market Effect

• Scenario: Apply EU-like trade-wedge symmetry to non-EU economies.
• Outcomes:
  • Still reduces bilateral imbalances but to a lesser extent (~30% reduction).
  • Increases incomes in regions like North America and Asia-Pacific (~5% in Mexico), narrowing income distribution.
  • Long-term effects: Detrimental to the U.S.-China trade war primarily due to reduced trade ties; global real incomes increase slightly (~0.5-1%).

Financial Autarky

• Implements prohibitive barriers to international asset trade.
• Outcomes: Redistributes capital, affecting real incomes but not altering the persistence of bilateral imbalances.

Policy Implications

• Trade Policy: Asymmetric trade barriers significantly shape imbalances. Single Market membership reduces these barriers.
• Decoupling Concerns: Attempts to decouple trade (e.g., U.S.-China war) reduce specific imbalances but are costly overall due to macroeconomic adjustments.
• Economic Integration: Expanding Single Market-like policies could enhance interconnectedness and welfare gains.

Conclusion

• Gravity models confirm that bilateral trade-wedge asymmetries are the primary driver of cross-country imbalances.
• These asymmetries have meaningful macroeconomic consequences.
• Further study is needed to understand their origins (geography, technology, policies) and implications.