How does the currency carry trade work and what are its risks?

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AcadiFi · Accepted Answer

The currency carry trade borrows in a low-yielding currency (funder) and invests in a high-yielding currency (target), earning the interest rate differential. Classic example: borrow JPY at 0.25%, convert to AUD, invest at 4.5%, earning 4.25% annually if spot stays unchanged. Covered interest parity (CIP) says forward rates should offset this entirely, but uncovered — holding spot — historically earns the carry premium. A hedge fund like Ashford Macro Partners running $2B carry book might go long AUD, NZD, MXN, BRL and short JPY, CHF, EUR in various pairs, scaled by volatility and rate differential strength. Returns exhibit positive skew reversal: small consistent gains as rate differentials accrue, punctuated by violent 5-15% drawdowns during risk-off episodes — hence 'up the stairs, down the elevator'. The 2008 collapse of AUD/JPY (from 107 to 55 in six months) demonstrated tail risk. Theoretical explanation: carry trades earn a risk premium compensating investors for bearing global systemic risk exposure. Risk management techniques: (1) volatility targeting — scale positions inversely to realized volatility; (2) crash signals — reduce when VIX, EM CDS, or volatility of volatility spikes; (3) options overlay — buy OTM puts on carry currencies; (4) concentration limits; (5) funding currency diversification. Carry performs best in low-volatility, trending regimes and worst in volatility spikes. Central bank policy divergence drives carry opportunities — 2022-2025 BOJ accommodative stance vs Fed tightening created the deepest carry environment in a decade.

How does the currency carry trade work and what are its risks?

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