Skip to content

Lesson M21.L04: International Policy Coordination and Global Imbalances

Module: M21: Open Economy Macroeconomics Part II Level: intermediate Duration: 30 minutes Learning Objective: Evaluate whether international policy coordination can resolve the prisoner's dilemma of global imbalances. Data as of: 2024 Provenance: IMF World Economic Outlook Database | G20 Framework for Strong, Sustainable and Balanced Growth

Explanation

Global imbalances refer to persistent large CA surpluses and deficits across major economies. The defining post-2000 pattern: the United States ran large CA deficits (−3% to −6% GDP), funded primarily by surpluses in China, Germany, Japan, and oil exporters. China's CA surplus peaked at approximately 10% of GDP in 2007, before falling to 1–2% of GDP by 2023 as Chinese domestic consumption rose and export competitiveness declined.

Why do imbalances persist? The prisoner's dilemma:

Every country prefers to run a CA surplus (exporting more than importing) because surpluses support domestic employment and accumulate foreign assets. But if every country simultaneously tries to run a surplus, global CA must net to zero — it is a zero-sum aggregate. This creates a classic prisoner's dilemma structure.

2×2 Payoff Matrix (Symmetric two-country model: Country A and Country B)

Each country chooses between Expand domestic demand (cooperative — reduces surplus/increases deficit) or Maintain surplus (defect — export-led, contractionary for partner):

Country B: Expand Country B: Maintain Surplus
Country A: Expand (3, 3) — Both grow, balanced trade (1, 4) — A runs deficit; B gains
Country A: Maintain Surplus (4, 1) — A gains; B runs deficit (2, 2) — Stagnation, both lose

Payoffs: 4 = best for one country; 3 = cooperative optimum; 2 = Nash equilibrium (mutual defection); 1 = worst outcome.

Nash equilibrium: Both countries maintain surpluses → (2, 2). This is the prisoner's dilemma: individually rational but collectively suboptimal. The cooperative outcome (3, 3) requires binding agreements.

G20 Framework for Strong, Sustainable and Balanced Growth:

The G20 established this framework in 2009 to address imbalances through coordinated commitments on fiscal policy, exchange rate flexibility, and structural reforms. Australia hosted the 2014 Brisbane G20 Summit and championed the 2% growth target — a commitment to collective policies that would lift G20 GDP by an additional 2% above baseline over five years. The IMF's Article IV surveillance mechanism provides annual external assessments of each country's CA position and exchange rate, identifying "excessive" imbalances and recommending adjustment.

Effectiveness: The framework has had mixed results. China's surplus did fall significantly — partly from G20 pressure, but also from structural shifts in Chinese domestic demand. The US deficit narrowed after the Global Financial Crisis (domestic deleveraging reduced imports). However, Germany and Japan maintained large surpluses throughout, and the IMF's surveillance lacks enforcement power. The prisoner's dilemma is only partially resolved — cooperation is voluntary and fragile.

Australia's role: As a commodity exporter, Australia typically runs deficits (M21.L01–L02). Australia has an interest in a balanced global economy: weak global demand depresses commodity prices and reduces Australia's terms of trade. Australia championed multilateral coordination at the Brisbane summit specifically to boost global demand.

Worked Example

Numerical application: The US–China imbalance and required adjustment

Given (2007 baseline): - China CA surplus: +10% of Chinese GDP - China GDP: USD 3.5 trillion - US CA deficit: −5% of US GDP - US GDP: USD 14 trillion

Step 1: Calculate absolute CA values.

\[CA_{\text{China}} = 0.10 \times 3.5 = +\text{USD } 350\text{bn}\]
\[CA_{\text{US}} = -0.05 \times 14 = -\text{USD } 700\text{bn}\]

Step 2: The US−China bilateral portion. Suppose China's surplus with the US is approximately 60% of China's total surplus:

\[CA_{\text{China→US}} = 0.60 \times 350 = +\text{USD } 210\text{bn}\]

Step 3: Coordination target. Suppose G20 agrees to halve China's surplus to 5% GDP, and US agrees to reduce deficit to −3% GDP. Calculate the required adjustment.

\[\Delta CA_{\text{China}} = (0.10 - 0.05) \times 3.5 = -\text{USD } 175\text{bn (surplus falls by 175bn)}\]
\[\Delta CA_{\text{US}} = (-0.03 - (-0.05)) \times 14 = +\text{USD } 280\text{bn (deficit narrows by 280bn)}\]

Step 4: Prisoner's dilemma check. If China cooperates (reduces surplus) but the US does not adjust (maintains deficit), China loses export-sector output (~175bn), while the US benefits from continued cheap imports. This is the (1, 4) outcome — China gets 1, US gets 4. The incentive to free-ride means China will not cooperate unilaterally, requiring binding enforcement or reciprocal commitments.

Step 5: Brisbane Summit 2% target. By 2018, the collective G20 pledged policies were estimated by the IMF to add approximately USD 2 trillion to global GDP — roughly equivalent to a large economy joining world output. Australia's contribution included infrastructure investment packages and labour market reforms.

Common Misconception

Misconception: Global imbalances are simply caused by unfair trade policies (currency manipulation, tariffs) and can be resolved by trade sanctions.

Correction: While exchange rate misalignment can contribute to imbalances, the fundamental drivers are macroeconomic saving-investment gaps (CA = S − I). China's surplus reflected high national saving (high household saving + corporate retained earnings + fiscal surplus), not merely an undervalued renminbi. Trade sanctions address symptoms, not causes, and risk retaliation that shrinks global trade volumes — making all countries worse off. Effective coordination requires countries to adjust their domestic saving-investment balances through fiscal policy, financial reform, and social insurance (which reduces precautionary saving). This is precisely the framework the G20 advocates, and why the IMF's surveillance focuses on the "current account norm" relative to fundamentals rather than bilateral trade balances.

Practice Prompts

  1. Conceptual: Why does the global current account sum to zero? What does this imply for the feasibility of every country simultaneously targeting a CA surplus? → Answer: The global CA sums to zero because every export is another country's import, and every financial outflow is another country's financial inflow. In a closed global economy, the sum of all national CA balances must equal zero by accounting identity. This means it is mathematically impossible for all countries to run CA surpluses simultaneously — if some countries increase their surpluses, others must increase their deficits by the same aggregate amount. A world where all countries pursue surplus is therefore self-defeating: individual rationality conflicts with collective feasibility, which is precisely the prisoner's dilemma structure.

  2. Numerical: Using the payoff matrix in the Explanation section, suppose the payoffs shift due to global recession — cooperative outcome falls to (2, 2) and mutual defection falls to (0, 0). Draw the new matrix and find the Nash equilibrium. Is coordination now more or less likely? → Answer: New matrix: | | B: Expand | B: Maintain Surplus | |---|---|---| | A: Expand | (2, 2) | (0, 3) | | A: Maintain Surplus | (3, 0) | (0, 0) | Nash equilibrium: Both maintain surplus → (0, 0). But now the mutual defection payoff (0,0) is lower relative to cooperation (2,2) compared to the original matrix — the gap widens. This actually makes coordination more valuable (the gain from cooperation is larger), but also more unstable: each country still has a unilateral incentive to defect (3 > 2). In practice, global recessions (like 2008–09) do tend to produce more coordination (G20 stimulus packages), suggesting that when the cost of defection becomes severe, countries find cooperation more attractive. This is consistent with Axelrod's repeated-game analysis: cooperation emerges when the shadow of the future is long enough.

  3. Application: Australia hosted the 2014 Brisbane G20 Summit and championed the 2% growth target. Evaluate whether this represented genuine policy coordination or was primarily a public relations exercise. → Answer: The Brisbane 2% target had genuine substance in its design — the IMF reviewed each G20 member's growth plans and found a credible combined package worth ~USD 2 trillion in additional GDP. Australia's own contribution included a new National Infrastructure Plan. However, the target lacked enforcement: countries could submit and then fail to deliver pledges without penalty. Subsequent IMF reviews found mixed compliance, with infrastructure commitments often delayed. The target succeeded in shifting the conversation from austerity to growth-focused policy (relevant post-GFC), and China's subsequent fiscal expansion partly reflected G20 commitments. Overall verdict: a partial success — more than optics, less than binding coordination. The IMF's external sector reports (from 2012) provide the strongest ongoing coordination mechanism, but still lack teeth.

Further Resources