2024-09-09-国际清算银行-2024年8月市场动荡和套利交易解除（英）_8页_1mb

BIS Bulletins are staff publications of the Bank for International Settlements (BIS) with technical character and independent author views.

Key Takeaways

1. Market Turbulence Cause

   • In early August 2024, financial markets experienced significant volatility triggered by the unwinding of leveraged positions and currency carry trades following a U.S. jobs report that raised recession fears.
   • Japanese market losses were severe (TOPIX down 12% in one day), driven by yen strength and forced liquidations.

2. Mechanism of Amplification

   • High leverage amplified market moves due to margin calls, creating significant selling pressure.
   • Currency carry trades (borrowing low-yielding yen to invest in higher-yielding currencies) were particularly hard hit, as volatility breached stable assumptions embedded in these strategies.
   • Leverage in the U.S. hedge fund sector was rising prior to the event.

3. Size and Scope

   • FX carry trade positions are difficult to quantify precisely but estimated to be worth up to ¥40 trillion ($250 billion), dwarfed by off-balance-sheet derivative strategies.
   • Asset class spillovers occurred as investors liquidated positions to meet margin calls.

4. Volatility and Market Integrity

   • While markets recovered quickly, mechanisms leading to volatility remain unchanged, including procyclical deleveraging.
   • Systemic risks from high leverage, margin requirements, and narrow carry trade profitability necessitates ongoing policy attention.

5. Structural Vulnerabilities

   • The underlying cause lies in market-based finance and high leverage positions, requiring monitoring to avoid protracted amplification loops.

Major Triggers

• Expected policy "hawkishness" from the BoJ and cautious Fed stance shifted investor focus onto the August 2 jobs data.
• Changes in funding costs and market positioning prior to the event amplified reaction.

Conclusion

The August 2024 market episode highlights three critical points: 1) Policies suppress volatility but compound market fragility if leveraged positions grow unchecked; 2) Foreign exchange flows have become essential conduits for carry trading; and 3) Protracted mechanisms exist for unwinding positions.

Although markets reacted quickly and with apparent resilience, underlying vulnerabilities persist. The interplay of leverage and policy expectations remains a key determinant for financial stability.