The carry trade links interest rates, exchange rates, leverage, and market stress. In calm markets it can look steady and profitable. When volatility rises or funding conditions change, it can reverse very fast.
Theme
FXRates
What is a currency carry trade?
Borrow in a low-interest-rate currency.
Convert into a higher-yield currency.
Invest in the higher-yield asset or deposit.
Keep the spread if the funding currency does not strengthen too much.
Classic example: borrow in yen or Swiss francs, then invest in a higher-yield market such as U.S. dollars during a hiking cycle.
Step
What the trader wants
Main risk
Funding leg
Cheap borrowing cost
Funding rates rise unexpectedly
Investment leg
Higher yield
Target market falls or yields reverse
FX leg
Stable or favorable exchange rate
Funding currency strengthens during stress
Calm markets
Why carry trades look attractive in calm markets
Interest-rate differentials are visible and easy to compare.
Funding currencies often stay weak or stable for long stretches.
Volatility remains low, so leverage feels manageable.
Past success can draw in more capital, making the strategy look safer than it really is.
Important pattern: carry returns often look small, steady, and easy right before conditions become much more dangerous.
Stress events
Why carry trades can fail violently
Common triggers
A surprise rate hike in the funding currency.
A sudden flight to safety that pushes investors back into the funding currency.
Large equity or credit selloffs that force deleveraging.
Geopolitical stress that raises volatility and cuts risk appetite.
What the unwind looks like
Carry traders rush to close positions.
The funding currency appreciates quickly.
Losses spread across FX, bonds, equities, and commodities.
Leverage amplifies moves that might otherwise have looked manageable.
Core lesson: the strategy is often effectively short volatility. It tends to suffer most when volatility and safe-haven demand rise together.
UnwindRisk
Why unwinding happens, why it is risky, and what people usually expect next
Why an unwind starts
The interest-rate advantage narrows or looks less certain.
The funding currency starts strengthening instead of staying weak.
Volatility rises and leverage becomes harder to carry.
Margin calls and risk limits force investors to cut positions quickly.
Why it can happen suddenly: many carry positions are crowded and leveraged.
Once the market starts moving the wrong way, one seller can force another seller.
Why it is so risky
Carry gains are often gradual, but FX losses can be sudden and large.
The same trade may be embedded inside many portfolios at once.
Investors may need to sell unrelated assets just to cut risk or raise cash.
Liquidity that looked strong during the build-up can weaken fast during the unwind.
Main danger: an unwind is not just an FX event.
It can become a cross-asset deleveraging event.
Question
Typical market answer
What often happens to the funding currency?
It strengthens as people rush to cover positions.
What often happens to risky assets?
They can fall as leveraged positions are cut.
What often happens to volatility?
It rises sharply.
What often happens to liquidity?
It can thin out right when markets want it most.
What to expect during a serious unwind
A stronger funding currency, especially the yen in a yen-funded unwind.
Faster moves than many investors expected from the carry spread alone.
More correlation across markets as positions are reduced together.
Periods where headlines, volatility, and flows matter more than valuation models.
What people usually watch or do
Watch BOJ policy, USD/JPY, implied volatility, and broader risk sentiment.
Watch whether credit spreads and equity volatility begin rising together.
Risk managers typically reduce leverage and cut crowded positions.
Investors usually become much less willing to assume that calm conditions will return immediately.
NecessaryAdjustment
Why unwinding is sometimes necessary
Why markets may need an unwind
Too much cheap leverage can build up when a funding currency stays low for too long.
Asset prices can rise beyond what underlying fundamentals justify.
Risk can become hidden because low volatility makes positions appear safer than they are.
When policy changes, markets need to reprice risk, funding costs, and exchange-rate assumptions.
An unwind is painful, but it can also be part of the market’s way of removing excess leverage and forcing prices back toward more realistic levels.
Why it feels so unpleasant
The adjustment is often delayed for a long time, then compressed into a short period.
Positions that looked profitable under calm conditions may be revealed as fragile.
Liquidity can disappear at the exact moment many investors want to exit.
The necessary repricing of risk often looks chaotic in real time.
What is “necessary” for the system is not always painless for markets, portfolios, or investors.
Before unwind
Why adjustment becomes necessary
Cheap funding encourages leverage
Leverage eventually becomes too large for the new environment
Risk looks low
Markets must reprice the true level of risk
Cross-asset positions expand
Correlations and liquidity assumptions must be tested
Asset prices are supported by flows
Prices must adjust when those flows reverse
JapanPolicy
Why did Japan keep interest rates so low for so long?
Main economic reasons
Japan spent many years with very low inflation or deflation.
Economic growth was weak, so policymakers wanted to support borrowing, spending, and investment.
Wage growth was slow, making it harder to create a normal inflation cycle.
Very low rates were used to reduce the risk of falling back into stagnation.
Japan did not keep rates low because low rates are always desirable.
Japan kept rates low because the economy was weak enough that tighter policy was seen as risky for growth and inflation.
Problem
Why low rates were used
Deflation / near-zero inflation
To push prices and inflation expectations upward.
Weak domestic demand
To encourage borrowing and spending.
Slow wage growth
To support firms, employment, and the recovery cycle.
Long stagnation mindset
To break the habit of expecting flat prices and weak growth.
For years, ultra-low Japanese rates became both a domestic policy tool and a global funding source.
LiquidityU.S. markets
How did cheap yen funding help support U.S. financial markets?
How the channel works
Investors borrow cheaply in yen.
They convert those funds into dollars or hedge the FX risk.
They buy higher-yielding assets such as bonds, loans, equities, structured credit, or other risk assets.
As more capital enters those markets, funding conditions can look easier and liquidity can look better.
Cheap foreign funding can help support demand for U.S. assets, compress spreads, and make leveraged positions easier to finance.
Why people say it “creates liquidity”
More borrowed money chases financial assets.
Risk premia can look smaller than they otherwise would.
Funding becomes easier for leveraged investors.
Trading activity rises across FX, bonds, credit, and equities.
This is often fragile liquidity, not permanent liquidity.
When positions reverse, the same apparent support can vanish quickly.
During the build-up
During the unwind
Borrowing looks cheap
Funding costs rise or funding becomes harder
Spreads can compress
Spreads can widen sharply
Risk assets are supported
Risk assets can sell off together
Volatility looks low
Volatility can spike
NowRisk
Why is this becoming more troublesome now?
Three reasons
Japan is no longer locked into the old ultra-low-rate regime. If policy keeps normalizing, the funding advantage becomes less one-sided.
Global leveraged positions may have grown too large. A strategy that looks safe for too long usually attracts more capital.
Markets are highly connected. A carry unwind can spread through FX, U.S. credit, equities, and other risky markets.
Why the unwind can hit the U.S.
Leveraged investors may need to sell U.S. assets to reduce risk.
Credit spreads can widen if funding gets tighter.
Equity volatility can jump as positions are cut.
Even if Treasury yields fall in a flight to safety, broader market stress can still hit risk markets.
The more realistic concern is not “Japan collapses.”
It is that policy normalization, a stronger yen, or a risk shock could trigger a broader deleveraging wave.
Why would the U.S. care about a Japanese funding shock?
Because yen funding has been used far beyond Japan itself.
Because leveraged global investors often hold U.S. assets.
Because an unwind can reduce liquidity and raise volatility at the same time.
Because “safe” and “risky” parts of the U.S. market can react very differently during stress.
Example2022
Example: U.S. policy tightening in 2022
When U.S. policy rates moved sharply higher in 2022, dollar yields became much more attractive relative to low-rate funding currencies such as the yen. That made carry ideas look stronger on paper, but it also increased the importance of exchange-rate risk, leverage, and sudden volatility if the funding currency later strengthened.
Carry idea (simplified): expected payoff ≈ interest spread + FX move
Question
What to think about
Why did U.S. assets look attractive?
Because the yield differential widened as U.S. rates rose.
What could still go wrong?
If the funding currency strengthened or risk assets sold off, carry gains could disappear quickly.
Why is this linked to UIP?
UIP says higher-yield currencies should depreciate enough to offset the rate advantage, but that often does not happen smoothly in practice.
CalculatorScenario
Carry-trade shock simulator
JPY funding → USD investing
Simplified model: carry return ≈ interest spread + FX move. Real-world losses can become much larger when leverage, margin calls, and forced selling appear.
Output will appear here.
How to read the result
If the funding currency strengthens sharply, the FX term can wipe out the interest spread.
A positive carry spread is not enough if leverage forces traders to reduce risk at the wrong time.
The most dangerous periods are often the ones right after a strategy has looked easy for too long.
Scenario idea: compare a calm year with a shock year in which the funding rate rises and the funding currency suddenly appreciates.
DiscussionProspects
Japan carry-trade issues, prospects, and U.S. spillovers
What is happening in Japan economically?
Japan is trying to move from a long low-inflation era toward a more normal inflation-and-wage environment.
That transition is difficult because the economy is not a high-growth economy.
Even if inflation becomes more normal, Japan still has to be careful not to tighten so much that it damages growth.
This makes Japanese policy especially important for global funding markets.
Why did the yen carry trade become so important globally?
The yen was a cheap funding currency for years.
That encouraged borrowing in yen and investing abroad.
The strategy spread into many markets, not just plain spot FX trades.
As a result, a “Japan story” became a global risk story.
What if Japan has a serious policy or market shock?
The yen could strengthen sharply as positions unwind.
Leveraged investors could sell U.S. and other foreign assets.
Credit spreads could widen and liquidity could worsen.
The U.S. would not be isolated, because global portfolios are highly connected.
What is the balanced conclusion?
Japan is not automatically “bad” for the world.
For many years, low Japanese rates helped support global funding and risk-taking.
The problem is that the longer a cheap-funding regime lasts, the more the system can build leverage around it.
That is why normalization can be healthy in the long run but dangerous in the short run.
One-sentence summary:
Japan’s very low-rate era helped support global liquidity, including U.S. markets, but the longer that system lasts, the more painful the unwind can become when policy and expectations change.
QuizReview
Module 10 quiz
Use the quiz below to review the key ideas from this module, including the carry trade, yen funding, market unwinding, risk, and spillover effects.
Quiz format: 10 true/false questions with instant explanation after each answer.
Possible effects on U.S. assets, volatility, and liquidity
HomeworkAnalysis
Homework — Which assets may benefit, and which may be hurt, by a carry-trade unwind?
Write a short analysis explaining which assets or markets may benefit from an unwind and which may be hurt. Focus on the logic of leverage, safe-haven demand, funding stress, and cross-market contagion.
Assets or markets that may benefit
The funding currency, especially the yen, if investors rush to close short-yen positions.
Traditional safe-haven government bonds in a broad risk-off move.
Cash and other liquid defensive holdings.
Some defensive sectors if investors move away from highly leveraged or speculative assets.
Assets or markets that may be hurt
Equities, especially higher-beta or more leveraged areas.
Corporate credit if spreads widen as risk appetite falls.
Emerging-market assets that relied heavily on global yield-seeking flows.
Any market that benefited from easy leverage and cheap foreign funding.
Homework question
What to explain
Which asset may rise?
Explain whether it benefits from safe-haven demand, short covering, or falling yields.
Which asset may fall?
Explain whether it depends on leverage, easy funding, or strong risk appetite.
Why can unrelated assets fall too?
Explain margin calls, deleveraging, and forced selling.
What is the main message?
Explain that a funding unwind can spread far beyond FX.
Suggested response format
Name one asset or market likely to benefit.
Name one asset or market likely to be hurt.
Explain the economic logic for each.
Finish with one paragraph on why the unwind can spread across markets.
VideosCurrent watch
Videos and current risk watch
These two videos help connect the basic idea of the carry trade to the current market discussion around Japan, the yen, leverage, and possible spillovers into U.S. markets.
Video 1 — What is the carry trade and why did it cause market chaos?
Current risk watch: a careful market phrasing is not “the carry trade is definitely unwinding right now,” but rather
“markets are still watching for yen-carry stress as Japan slowly normalizes policy and global volatility remains elevated.”
How to describe the current setup
The Bank of Japan has moved away from the old zero-rate world, but policy is still low by international standards.
That means the yen can remain a funding currency, but the trade is not as one-sided as it looked when Japanese rates were near zero.
If Japan tightens further, or if markets rush into the yen during a risk event, leveraged carry positions can still unwind sharply.
The issue is not just FX; it can affect global equities, credit, and funding conditions.
What people usually watch
Question
What markets watch
What matters most from Japan?
BOJ policy, inflation, wages, and the yen.
What matters most from markets?
Volatility, leverage, and whether deleveraging is spreading across assets.
Why do U.S. markets care?
Because yen funding has supported global positions, including positions tied to U.S. assets.
What is the main public takeaway?
Carry can look calm for a long time, then become a broad market risk very quickly.