Carry Trade

What Is a Carry Trade?

The carry trade exploits the gap between borrowing costs and investment yields. In its classic form, a trader borrows Japanese yen (historically at near-zero rates), converts them to US dollars, and invests in higher-yielding US assets. The profit is the interest rate differential — the "carry."

The trade works as long as the exchange rate remains stable or moves in the investor's favour. It fails explosively when the high-yield currency depreciates against the funding currency faster than the carry income compensates.

The Yen Carry Trade

The Japanese yen has been the world's most popular funding currency for decades due to the Bank of Japan's ultra-loose monetary policy. Trillions of dollars of carry trades were funded in yen at near-zero rates and deployed into US Treasuries, equities, and emerging market assets.

When the BOJ unexpectedly raises rates — as it did in 2024 — yen borrowing becomes more expensive and the yen strengthens. Carry traders are forced to sell their higher-yielding assets and buy back yen simultaneously, creating correlated liquidation across seemingly unrelated markets.

Why It Matters for All Traders

Carry unwinds are contagion events. In August 2024, a BOJ rate surprise triggered a sudden yen surge that caused a 12% intraday decline in the Nikkei and a sharp global equity sell-off. Assets with no fundamental connection to Japan fell simply because they were held by carry traders who needed to raise yen.

Understanding which trades are funding the carry and when unwinds might occur is a critical macro risk management skill.