Japan’s rate hike and month 8 market turmoil

Conditions at the time

Leveraged positions using yen funding to invest in risky assets had accumulated in the market.

How events unfolded

The Bank of Japan decided on a 0.25% rate guideline on 7/31, and financial-market volatility increased in early month 8.

Stakeholders and impacts

Carry traders, equity investors and intermediaries responded to changes in exchange rates, margins and borrowing conditions.

Information available at the time

Reactions to adverse US macroeconomic indicators overlapped with liquidations of equity and currency positions.

Findings confirmed later

BIS research emphasized how procyclical deleveraging and rising margin requirements amplified fluctuations.

Alternative interpretations and limitations

The total size of carry positions is difficult to measure precisely, and Japan’s rate decision is not considered the sole cause.

Source-based context and interpretation

The BOJ changed its short-rate guideline and bond-purchase plan in month 7. BIS researchers found that month 8 volatility amplified an initial reaction to U.S. data through leveraged-position unwinds before subsiding rapidly. ASSETCASTING interpretation: A single BOJ decision cannot explain the whole sell-off. Compare funding and margin structures that force liquidations, not just simultaneous currency and equity moves.

Evidence coverage through 2024-08-27 · Sources checked 2026-10-14

• Change in the Guideline for Money Market Operations and Decision on the Plan for the Reduction of JGB Purchases ↗
• The market turbulence and carry trade unwind of August2024 ↗

Related events and periods1

• Inflation response and interest-rate adjustment →

  An event or period whose recorded start falls within this editorial interval. This does not establish that it caused or represents the characteristics of the era, nor guarantee that the entire period falls within the interval.