Carry Trade Explained
Borrow cheap in one currency, invest for a better yield in another — the carry trade is one of the oldest strategies in currency markets, and one of the fastest to unravel.
The basic mechanics
A carry trade means borrowing in a currency with a low interest rate, converting the proceeds into a currency with a higher interest rate, and investing them there to pocket the difference. The strategy has existed in currency markets for decades because it's conceptually simple: as long as exchange rates stay roughly stable, the trade earns the rate differential — often called the carry — with relatively little effort.
Why it works, until it doesn't
Carry trades tend to thrive in calm, low-volatility markets, where investors are comfortable holding currency risk in exchange for steady yield. Funding currencies are typically those tied to persistently low interest rates, which makes borrowing cheap; target currencies are typically those from economies offering higher yields to compensate for their own risk or inflation profile. Because low volatility is a precondition for the trade to feel safe, measures of expected currency and equity volatility are watched closely as a gauge of how comfortable carry positioning is at any given time.
Currency risk can erase the gain
The rate differential a carry trade earns is often modest compared to how much exchange rates can move in a single trading session. If the funding currency strengthens — or the higher-yielding currency weakens — the loss on the currency conversion can wipe out months or years of accumulated carry in a matter of days. That asymmetry is the central risk of the strategy: slow, steady gains are exposed to fast, sharp losses.
Why unwinds happen so violently
Because carry trades are typically leveraged and widely held across many market participants at once, a shift in rate expectations, a spike in volatility, or a sudden move in the funding currency can trigger a rush to close positions simultaneously. Traders sell the higher-yielding currency and buy back the funding currency to repay their loans, which pushes the funding currency higher and the target currency lower — reinforcing the very move that triggered the unwind in the first place, and often spilling over into other risk assets as leveraged positions get cut across the board.
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Quick answers
What makes a currency a good carry trade funding currency?
A history of persistently low interest rates, which keeps borrowing costs cheap and makes the currency a common source of funds for buying higher-yielding assets elsewhere.
Can a carry trade lose money even if interest rates don't change?
Yes — the trade's profit comes from both the rate differential and the exchange rate staying stable, and a currency move against the position can erase the earned carry even with no change in rates.
Why do carry trade unwinds happen so suddenly?
Because many investors hold similar leveraged positions, a shift in sentiment or volatility can trigger simultaneous selling that pushes the funding currency sharply higher and amplifies the initial move.