What is a carry trade?

A carry trade is a strategy in which an investor borrows money in a currency with a low interest rate (the "funding currency") and invests the proceeds in a currency or asset that offers a higher interest rate (the "carry currency"). The profit comes from the difference between the interest earned and the interest paid, assuming exchange rates remain stable. The most classic carry trade has been borrowing in Japanese yen (historically near-zero rates) and investing in US dollars, Australian dollars, or emerging market currencies.

The appeal of carry trades is that they generate steady income during calm market environments. When exchange rate volatility is low and interest rate differentials are wide, carry trades can produce attractive risk-adjusted returns. The strategy has historically earned a positive return on average, an anomaly that contradicts the uncovered interest rate parity theory from textbook economics.

The risk of carry trades is concentrated in sudden, violent reversals. When global risk appetite deteriorates, investors rush to close carry positions, buying back the funding currency and selling the carry currency. This creates a feedback loop: the funding currency appreciates, causing losses for carry traders, forcing more position unwinds, driving more appreciation. These "carry trade unwinds" can cause sharp currency moves in a matter of hours.

The most dramatic carry trade unwind in recent history occurred in August 2024, when the Bank of Japan unexpectedly tightened policy, causing the yen to surge and triggering a global risk selloff. Trillions of dollars in yen-funded carry positions were unwound over several days, causing equity market declines of 5-12% across major markets and a VIX spike above 65. The episode illustrated how carry trade positioning creates hidden leverage and systemic risk in global financial markets.

For macro analysts, monitoring carry trade conditions involves tracking interest rate differentials, currency volatility (high volatility discourages carry), speculative positioning data (CFTC futures), and the yen, Swiss franc, and other traditional funding currencies. When carry is crowded and volatility is suppressed, the setup for a violent unwind is in place, creating both risk and potential opportunity for investors positioned accordingly.