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Carry

Investment Strategy Portfolio Construction Academic Finance

Carry is the return an investor earns from simply holding an asset, assuming its price does not change. Common examples include the interest-rate difference in a currency trade, the yield on a bond, and the roll yield earned when holding a futures contract.

The idea separates the return an asset pays for being held from the return it produces when its price moves. If nothing about the price changes, the carry is what remains: the coupon, the interest differential, or the roll. Because this component can be measured in advance, carry has become a widely studied signal across many markets, and strategies built around it appear in currencies, bonds, commodities, and equities.

Definition

Carry is the expected return on an asset under the assumption that market conditions stay still. For a bond, the carry is roughly its yield, the income it pays relative to its price. For a foreign-currency position, the carry is the difference between the interest rate earned on the currency held and the interest rate paid on the currency borrowed. For a futures contract, the carry is the roll yield, the gain or loss that comes from the gap between the futures price and the expected future spot price as the contract approaches expiry.

Carry is closely related to the broader idea of a risk premium (the extra return investors require for bearing risk), but the two are not identical. Carry is a mechanical measure of what an asset pays to hold, while a risk premium is the compensation theory says investors should demand. In some markets the two line up; in others, carry can reflect supply, demand, or hedging pressures rather than a clean reward for risk.

Key Principle

A carry trade generally means borrowing in a low-yield asset and investing the proceeds in a higher-yield one, aiming to keep the difference. The position earns the spread between the two yields for as long as prices stay roughly stable. The catch is that the position depends on stability: the carry accrues steadily in calm periods, but an adverse price move can wipe out months of accumulated carry in a short span.

How It Works

Consider a currency carry trade. An investor borrows in a currency with a low interest rate and converts the proceeds into a currency with a higher interest rate, collecting the interest difference. As long as the exchange rate does not move against the position, the investor keeps that difference. The same pattern appears elsewhere: holding a higher-yielding bond financed at a lower short-term rate, or holding a commodity futures position where the shape of the futures curve produces a positive roll.

Carry strategies typically rank many assets by their carry and take larger positions in the higher-carry ones, sometimes financed by short positions in lower-carry ones. This ranking approach connects carry to other systematic signals such as momentum, which ranks assets by their recent price trend. The two signals often behave differently across market regimes, which is one reason researchers study them side by side.

Carry Across Asset Classes

Carry takes a different concrete form in each market, but the underlying definition (the return from holding when prices stay still) is the same throughout. The table below summarizes how carry appears in four common asset classes.

Asset Class	Source of Carry	What Erodes It
Currencies	Interest-rate difference between the two currencies	Adverse moves in the exchange rate
Bonds	Yield earned relative to financing cost	Rising rates that push bond prices down
Commodities	Roll yield from the shape of the futures curve	Shifts in the curve or falling spot prices
Equities	Dividend yield relative to financing cost	Price declines or dividend cuts

In each case the carry is the steady component, and the price move is the uncertain component. The appeal of studying carry across asset classes is that the same definition travels, which lets researchers compare the behavior of the signal in very different markets and look for patterns that hold in more than one place.

Known Limitations

Limitations to Keep in Mind

Carry strategies are exposed to sudden sharp losses. The steady accumulation of carry in calm periods can be reversed quickly during stress, a pattern often called crash risk. Currency carry trades in particular have historically suffered abrupt reversals when investors rush out of higher-yielding positions at the same time.
Stable income can mask growing risk. A position that pays steady carry may look calm precisely when risk is building. The smooth return profile can encourage larger positions and more leverage, which then magnifies losses when the eventual reversal arrives.
Carry and risk are linked. A higher carry frequently signals that the market is demanding more compensation for a reason, such as higher volatility or a greater chance of loss. Reaching for the highest carry can mean taking on the risks that the carry was paying to compensate for.
Drawdowns can be deep and prolonged. Because reversals tend to cluster, carry strategies can experience a large drawdown (a peak-to-trough decline) that takes a long time to recover. The path of returns can be far less smooth than the steady carry figure suggests.
Financing and execution costs reduce the spread. Borrowing costs, transaction costs, and the practical difficulty of holding positions across many markets all eat into the measured carry. The carry available on paper is generally larger than the carry an investor can actually keep.

Academic Origin

Carry has a long history in currency research, where the persistent tendency of higher-interest-rate currencies to deliver returns ran against simple theory and became known as the forward-rate puzzle. Work by Markus Brunnermeier, Stefan Nagel, and Lasse Pedersen connected currency carry returns to crash risk and funding conditions, helping explain why the steady carry is periodically interrupted by sharp reversals.

Later work by Ralph Koijen, Tobias Moskowitz, Lasse Pedersen, and Evert Vrugt generalized the concept beyond currencies, defining carry consistently across currencies, bonds, commodities, and equities. This broader framing turned carry from a currency-specific curiosity into a cross-asset signal studied with a common definition, which is why the term now appears throughout quantitative research.

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