What a carry trade is, and why it unwinds so fast

The carry trade is one of the oldest strategies in the currency market, and the one that produces
the fastest collapses. Understanding it explains a lot of moves that otherwise look causeless.

1. The idea

Borrow a low-interest currency, convert to a high-interest one, and keep the difference. In margin
trading you do this simply by buying the pair with the high-rate currency first and
holding — the positive nightly swap is the carry.

The classic example: long USD/JPY while US rates sit well above
Japanese ones. You collect swap every night, and if the rate goes nowhere you still profit.

2. Why it appeals

• It produces steady cash flow without price having to move.
• It tends to work well in calm markets.
• Funds run it at enormous scale, so it becomes self-reinforcing: inflows push the rate the helpful
  way.

3. Why it collapses so fast

This is the important part. The carry trade has a badly asymmetric payoff: small steady
gains, large sudden losses.

When the market turns risk-off, funds close positions at the
same time. Closing requires buying back the low-rate currency — sending it sharply higher. Weeks of
accumulated movement can unwind in hours.

Three common triggers:

• A sudden jump in market volatility (a crisis, a geopolitical event).
• The low-rate currency’s central bank changing course unexpectedly.
• The rate differential narrowing faster than
  expected.

4. What a retail account should take from it

• Positive swap is not a sufficient reason to hold. Collecting $5 a night does not
  cover a 300-pip fall in one morning.
• Do not drop a stop loss because “I am collecting swap”. The signature mistake of
  the amateur carry trader.
• Pay attention when volatility rises. It is the early warning that a carry unwind
  is starting.

5. Signs the carry is unwinding

• The yen and the Swiss franc strengthening together, with no Japanese or Swiss news behind it.
• High-rate currencies falling together, regardless of each country’s own situation.
• Equity volatility indices spiking.

When all three appear at once, ordinary technical patterns tend to stop working for several sessions,
because flow is driving the market rather than
price structure.

This article is for information only and is not investment advice. Conditions and fee levels are published by the brokers and can change at any time — check with the broker you actually use. Leveraged forex and CFD trading carries a high level of risk and can cost you your entire deposit.