● Currency Shock, Capital Flight, FX Chaos
The real reason KRW-USD is fluctuating: capital flows matter more than interest-rate differentials
The key issue in this exchange-rate episode is not simply that “the won is weak because Korean rates are low.”
To understand why KRW-USD rose even when export-related dollar inflows were strong, how foreign equity selling affected the exchange rate, and why the Chinese yuan remained firm while the Japanese yen and Korean won weakened together, the full flow picture must be considered.
The point often missed in other coverage is that capital outflows have become larger than the current account surplus.
If this structure does not change, the exchange rate may stabilize in the short term but remain vulnerable over the longer term.
1. The main driver of the KRW-USD surge was supply and demand, not rates
The central message is that the exchange rate cannot be explained by a single variable.
Korea-U.S. rate differentials, money supply, current account balances, trade balances, foreign equity selling, export firms’ dollar conversion timing, and policy intervention all matter.
In particular, the main backdrop to the rise in KRW-USD through the first half of 2026 was foreign capital outflow.
Korea benefited from a strong memory semiconductor export cycle, and the trade balance surplus widened materially.
However, foreign investors sold Korean equities on a larger scale and converted funds into dollars, increasing dollar demand in the FX market.
In simple terms:
When exporters sell the dollars they earn, that supports the won.
When foreign investors sell Korean stocks and convert proceeds into dollars, that weakens the won.
In this case, the second force was stronger.
- Export strength → higher dollar supply → won support
- Foreign equity selling → higher dollar demand → won weakness
- Result: larger capital outflows pushed KRW-USD higher
This is the critical point.
In the past, a large current account surplus often translated more directly into a stronger won.
Today, global capital mobility is large enough that trade surpluses alone are not sufficient to explain exchange-rate moves.
2. “Excess liquidity drove the exchange rate higher” is partly correct, but incomplete
Money supply growth, especially M2, does affect the exchange rate.
If Korea’s money supply grows faster than that of the U.S., the won may depreciate relative to the dollar.
From that perspective, the claim that “more money was printed, so the won weakened” is not unreasonable.
However, that alone cannot explain the recent surge in KRW-USD.
The original discussion notes that the ratio between Korean and U.S. M2 and the exchange rate do not always move one-for-one.
In particular, there were periods when M2 growth slowed but the exchange rate rose more sharply.
In other words, money supply is an important variable, but not the decisive single driver.
The FX market moves on hundreds, sometimes thousands, of variables at once.
- M2 growth is one background factor behind won weakness
- The recent surge was driven more directly by foreign capital outflows and supply-demand imbalance
- Relying on money supply alone risks oversimplifying exchange-rate behavior
3. Why the Korea-U.S. rate spread does not fully determine the exchange rate
Many market participants first look at the Korea-U.S. policy rate spread when assessing KRW-USD.
In theory, higher U.S. rates make dollar assets more attractive and can pressure the won lower.
In practice, the FX market is more complex.
The discussion compares the past 10 years of Korea-U.S. policy rates and KRW-USD and notes that the relationship was sometimes reversed.
The clearest period in which rates and the exchange rate moved in tandem was the second half of 2022, when the Federal Reserve raised rates aggressively and the dollar strengthened sharply.
Outside that window, however, equity markets, current account data, global risk sentiment, geopolitical risk, foreign flows, and corporate FX conversion decisions had larger effects.
In summary:
- Rate hikes can support exchange-rate stability
- But rate hikes alone cannot control the exchange rate
- KRW-USD can rise even if the rate spread is unchanged
- In many periods, capital flows matter more than rates
Therefore, it is risky to say that “raising rates will always push the exchange rate lower.”
Rates are an important variable, but not the whole story.
4. Delayed dollar selling by exporters also amplified the rise in KRW-USD
Korean exporters, especially semiconductor companies, earned substantial dollar revenue as memory-chip prices improved and AI-related demand increased.
When export proceeds are not converted into won immediately, dollar supply in the FX market declines.
In that case, even a large trade surplus has a limited stabilizing effect on the exchange rate.
If companies expect KRW-USD to rise further, they may delay selling dollars.
Selling later allows them to convert the same dollars into more won.
That creates a feedback loop:
- Higher exchange-rate expectations
- Delayed dollar selling by exporters
- Reduced dollar supply in the market
- Further exchange-rate increases
- Additional delays in dollar conversion
This does not mean that all large exporters withheld dollar sales.
The discussion indicates that companies with significant dollar inflows did supply a meaningful portion to the market.
Still, delayed conversion by some large players clearly affected market sentiment.
5. Why the exchange rate retreated after July: policy response and concentrated selling
As the rise in KRW-USD intensified through June, the government responded more forcefully.
Verbal intervention, direct intervention, coordination with major exporters, and broader stabilization measures likely all played a role.
Another important event was the large dollar inflow linked to a major memory semiconductor company’s Nasdaq ADR listing, which appears to have been converted relatively quickly and in a concentrated manner, supporting the won.
The key issue here is not only the size of the inflow, but also its timing and concentration.
For example, WGBI-related inflows are very large in aggregate.
But if they arrive over 8 months, their daily impact on the FX market can be limited.
By contrast, ADR-related inflows may be smaller in total but can move the exchange rate more if converted in a short period.
- WGBI inflows: large in size but spread over time
- ADR inflows: smaller in size but concentrated
- In FX markets, timing and concentration can matter more than aggregate size
6. Why the Chinese yuan remains strong
The yuan’s strength is not explained by China’s economy alone.
China’s property sector remains weak, and domestic demand is not especially strong.
Even so, the yuan has remained firm because exports, asset reallocation, and geopolitical strategy have all been working together.
China has reduced exports to the U.S. but expanded shipments to ASEAN, Europe, Latin America, and Africa.
China is also no longer a low-cost exporter only.
It has been increasing value-added in EVs, batteries, solar, advanced manufacturing, and parts of the semiconductor supply chain.
China’s large trade surplus provides the basic support for yuan strength.
More importantly, China has been selling liquid dollar assets such as U.S. Treasuries and U.S. equities.
It is reducing dollar exposure while increasing holdings of yuan, gold, and domestic assets.
- China has reduced its U.S. Treasury holdings
- Dollar assets are being trimmed, supporting yuan demand
- Gold holdings are rising as a sanctions-resistant asset
- CIPS and swap lines are expanding yuan-based payment channels
This process accelerated after the Russia-Ukraine war.
After the West excluded Russia from SWIFT and froze part of its foreign reserves, China likely recognized its own vulnerability to similar measures.
That increased the strategic value of gold.
Gold is difficult to sanction.
Unlike the dollar, it is relatively neutral as a reserve asset.
7. China appears willing to tolerate some yuan strength
In the past, China was reluctant to allow a stronger yuan because it could weaken export competitiveness.
Recently, however, there has been growing acceptance that yuan appreciation may be necessary.
If China wants to move beyond a simple trade-based model and build longer-term financial influence, it must strengthen confidence in the yuan.
A full substitution for the dollar is not realistic in the short term.
Reserve currency status requires more than a strong exchange rate.
It also requires capital-account openness, legal credibility, market depth, military strength, alliance networks, and payment-system trust.
However, the shift has already begun.
Yuan settlement is gradually increasing among BRICS, Middle East, ASEAN, and other Global South economies.
Over time, the global system may evolve toward coexistence between the dollar bloc and the yuan bloc rather than a single dominant payment system.
8. Why the yen and the won weakened together
One of the most important points is that the yen and the won should be viewed together.
The two currencies have shown considerable co-movement recently.
There are three main reasons:
- Japan and Korea have both lost some export competitiveness relative to the past
- Taiwan and China have gained ground quickly in advanced manufacturing
- Low growth and low rates have encouraged domestic capital outflows
Japan was once the world’s leading trading power.
But U.S. pressure, Korea’s rise, and the growth of China and Taiwan have weakened its manufacturing dominance.
Korea faces similar pressures.
Memory semiconductors remain strong, but overall export competitiveness is being challenged by Taiwan and China.
Taiwan’s role has become more important as AI infrastructure investment and semiconductor supply chains are reorganized.
Domestic retail investors’ growing overseas equity allocation is also a won-negative factor.
When capital moves into U.S. mega-cap technology, AI names, and Nasdaq ETFs, demand for dollars rises and the won weakens.
9. Why the yen is still weak even after rate hikes
The Bank of Japan has moved away from negative rates and raised rates.
Normally, higher rates should support a stronger currency.
Yet the yen remains weak.
The reason is that fiscal policy remains highly expansionary.
The discussion describes this as fiscal dominance.
In other words, monetary policy is constrained by the government’s fiscal stance.
Put simply:
The Bank of Japan is turning on the air conditioner.
Rate hikes are meant to cool the economy.
But the government is turning up the heater through large fiscal spending.
As a result, the room remains warm.
That is why the yen has not strengthened meaningfully despite rate increases.
- Bank of Japan: rate hikes and balance-sheet reduction
- Government: active fiscal spending
- Market: skepticism about how far the BOJ can tighten
- Result: persistent yen weakness
10. The most important points often missed in other coverage
First, capital account flows matter more than the current account in the current exchange-rate environment.
Even with strong exports, the won can weaken if overseas investment and foreign selling are larger.
Second, a trade surplus does not automatically strengthen the won.
The exchange-rate effect only appears when exporters actually sell dollars into the market.
Third, even large events such as WGBI inclusion may have limited FX impact if inflows are spread out.
By contrast, concentrated dollar conversion linked to ADR flows can move the exchange rate materially.
Fourth, yuan strength is not only an economic issue but also a geopolitical payment-network strategy.
China is reducing dollar dependence and expanding yuan settlement and gold holdings.
Fifth, KRW weakness is also connected to the AI investment boom.
When domestic investors increase exposure to U.S. AI equities, the result is won selling and dollar buying.
AI semiconductor exports create dollar inflows, but overseas AI investment increases dollar demand.
11. KRW-USD outlook: short-term stabilization, long-term structural risk
The conclusion is cautious.
KRW-USD could ease in the near term.
Markets have momentum, and recent downward moves may continue if no new shock appears.
However, structurally, it is difficult to conclude that the won will remain strong.
The reason the won has been weak over the past few years is that capital outflows have exceeded the dollar inflows from the current account.
If that structure does not change, the exchange rate may face renewed upward pressure.
The discussion notes that different models produce different estimates of fair value.
- Policy view: around the 1,300s may be closer to normal based on fundamentals
- Macro model view: the 1,200s are possible
- Market-balance view: the 1,500s can also be treated as a plausible equilibrium range
This means exchange-rate forecasts cannot be reduced to a single number.
Results vary depending on the model and variables emphasized.
The most realistic interpretation is:
- Short term: policy response, exporter conversion, and market momentum can support stability
- Mid term: a move toward the 1,300s remains possible
- Long term: overseas investment and capital outflows remain a structural drag on the won
- Therefore, the strong-dollar cycle should not be considered over
12. Key indicators for investors and corporates
KRW-USD should not be assessed using U.S. rates alone.
The following indicators should be monitored together:
- Foreign investors’ net buying or selling of Korean equities
- Domestic retail investors’ overseas equity allocation
- Exporters’ dollar conversion behavior, especially in semiconductors
- Speed of WGBI-related inflows
- Timing of Federal Reserve rate cuts
- Persistence of yuan strength
- Co-movement between the yen and the won
- AI semiconductor cycle and memory-price trends
- Geopolitical risk and oil prices
For domestic investors, overseas equity exposure and exchange rates should be evaluated together.
Buying U.S. AI stocks can be rational at the portfolio level, but it increases dollar demand and can weigh on the won at the macro level.
For corporates, FX hedging has become more important.
When it is unclear whether KRW-USD will move back to the 1,300s or rise again toward the 1,500s, revenues and costs should be managed by currency exposure.
< Summary >
The true driver of the KRW-USD surge was capital outflow and foreign equity selling, not the Korea-U.S. rate spread alone.
Export-related dollar inflows were strong, but foreign selling was larger, leading to won weakness.
Money supply growth and rate differentials matter, but they are not sufficient to explain the exchange rate on their own.
The yuan’s strength reflects a combination of trade surpluses, U.S. asset sales, gold accumulation, and expansion of yuan settlement networks.
The yen and the won have weakened together due to export-competitiveness pressures, low growth, and higher overseas investment.
KRW-USD may stabilize in the short term, but if the capital-outflow structure does not change, upward pressure can return over the longer term.
[Related Articles…]
- KRW-USD Outlook and Strategy in a Strong-Dollar Environment
- AI Semiconductor Cycle and the Changing Structure of Korean Exports
*Source: [ 경제 읽어주는 남자(김광석TV) ]
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