Yuan Surplus & Exchange Rate Diplomacy Simulator

Evaluating Brad Setser’s argument in The Economist: China’s trading partners should coordinate for a stronger yuan rather than waiting for complex domestic social safety net negotiations. Model REER adjustments, the Marshall-Lerner condition, J-curve lags, and global manufacturing rebalancing.

Policy Levers & Elasticity

RMB Revaluation vs Basket +12.0%

Nominal trade-weighted appreciation vs major partners

Estimated Undervaluation 15.0%

IMF / CFR estimated REER gap from equilibrium

Domestic Consumption Boost +4.5%

Targeted fiscal transfers to pensions & rural healthcare

Export Price Elasticity (η_x) 0.85

Sensitivity of foreign demand for Chinese manufactured exports

Import Price Elasticity (η_m) 0.45

Sensitivity of Chinese demand for foreign capital goods/commodities

Exchange Rate Pass-Through 75%

Portion of currency move passed into export invoice prices

Impact Telemetry & J-Curve Trajectory (16 Quarters) Baseline Surplus: $950.0B

Surplus Reduction
-$268.4B
New run-rate: $681.6B

REER Effective Shift

+10.8%

ML Condition: η_x+η_m=1.30 > 1

Global Mfg Share Δ

Re-shored / Diversified

US Bilateral Deficit Δ

-18.2%

Direct trade rebalancing

EU Bilateral Deficit Δ

-14.7%

Clean tech & automotive relief

CA / GDP Ratio

1.6%

Down from 3.2% of GDP

Macro Assessment: Substantial global trade rebalancing achieved through currency adjustment without tariff retaliation deadweight loss.

Quarterly China Trade Surplus Path ($B Annualized) — J-Curve Lag Phase Q0 = Pre-Reform, Q16 = Long-run Equilibrium

Multilateral Bilateral Shift Matrix

Partner Region	Base Deficit ($B)	Projected Δ ($B)	Deficit Δ (%)

Policy Mechanism Tradeoff Analysis

1. Exchange-Rate Diplomacy (Setser Recommendation) Historical precedent: 1985 Plaza Accord & 2005 RMB reform. High diplomatic leverage, immediate price signal across all export sectors, bypasses internal Chinese legislative friction.

2. Domestic Pension & Retirement Benefit Expansion Addresses root cause (44% household consumption share of GDP), but global partners cannot enforce sovereign welfare budgets; execution lag spans 5–10 years.

3. Unilateral Tariff Escalation (Status Quo) Causes trade rerouting via third countries (ASEAN/Mexico), tariff evasion, consumer deadweight losses, and retaliatory yuan depreciation pressures.

Model Active (Marshall-Lerner Condition Met)

Theoretical & Empirical Framework: Calculations utilize the Marshall-Lerner theorem (ΔTB = X · [η_x · P_T + η_m · P_T - 1] · Δe) integrated with an autoregressive polynomial lag for contract stickiness (J-curve absorption over quarters 1–4). Baselines reflect Chinese Customs 2024–2025 annualized manufactured export figures and Council on Foreign Relations (Brad Setser) macroeconomic estimations.