Strong Dollar and Your ETF: The 20% Effect

Published July 4, 2026 · Last reviewed July 16, 2026 · Educational analysis only. Not personalized financial advice.

This analysis models twelve currency-drag scenarios in Python from MSCI endpoint data. It covers unhedged international stock funds held by US-dollar investors, not bond funds or hedged share classes.

Why Did Your International Fund Lag for a Decade?

A decade of dollar underperformance looks like hard proof that international diversification failed or the funds were badly chosen. US-exceptionalism headlines, brokerage screens that render returns only in dollars, and peers who skipped foreign stocks and won all reinforced that verdict. None of those screens display the currency line.

Something reduced a decade of foreign gains before they reached your screen.

The fund’s construction is the reason. VXUS and IXUS ship unhedged by default. No in-fund setting turns currency risk off. The currency portion of the gap rides on that one design choice.

Nuri’s currency gap is the same arithmetic that shows up across other hidden-cost analyses on this site: different mechanisms, one compounding ledger. No platform pockets this money. The other side of the exchange rate, holders of dollar assets, absorbs what your foreign gains gave up.

The decade-long lag most investors blamed on picking the wrong funds started one level higher, in the asset allocation strategy that set their international weight.

If you still hold an international fund, the gap already sits inside your balance. If you sold after the lag, you may have graded one culprit too harshly. If you are eyeing hedged funds now, you may be buying the cycle at its turn.

If fund selection was not the whole problem, what quietly took a decade of returns?

How Does a Strong Dollar Reduce International ETF Returns?

The dollar’s climb enters your fund through a single daily line, the currency conversion.

Currency drag enters through the fund’s daily net asset value, which converts every local close into dollars at that day’s rate. The math is one multiplication: dollar return equals local return times the exchange-rate factor. Across the decade window, that factor turned a 2.1059 local growth multiple into 1.6400 for US holders. One NBER study, Obstfeld and Zhou 2023, estimates the dollar cycle drives roughly a fifth of emerging-market equity swings at a two-year horizon. That estimate applies to emerging-market equities, not to every holding in a broad international fund.

How does the currency conversion cut returns?

A rising U.S. dollar cuts international ETF returns at the fund’s daily net asset value. Each foreign close converts into fewer dollars. From 2014 to early 2024, that turned a 110.59 percent local gain on MSCI World ex USA into 64 percent in dollars.

Why does the study focus on emerging markets?

Obstfeld and Zhou’s 2023 NBER study ties roughly 20 percent of emerging-market equity-price variance to the dollar cycle at a two-year horizon. That is the market segment their paper measures directly; it is not a decomposition of a broad international ETF or a direct comparison with developed-market indexes.

📚 Source: Obstfeld & Zhou, 2023 · nber.org

Before Obstfeld and Zhou 2023, retail guidance treated currency as noise that washes out over time. Their decomposition assigned it a measured share, around 20 percent of emerging-market equity-price variance. Modern analysis now treats the dollar cycle as a structural driver, not background static.

Ten years of foreign gains, one daily conversion to hand a third back.

Read together, the two NBER findings extend one another. They divide the labor. Obstfeld and Zhou measure how much the dollar moves emerging-market prices, and Du and Huber confirm the response, since institutions hedge that same risk, mostly on the bond side.

Global investors ran roughly $2 trillion in currency hedges by 2019, mostly on bonds, while stock exposure stayed largely unhedged.

📚 Source: Du & Huber, 2024 · nber.org

So how big did that conversion get across a full decade?

How Big Was the Strong-Dollar Effect on International ETFs?

Start with the dollar itself, the one force sitting under every international statement of the decade.

A single macro currency force sat under every unhedged international fund statement of the past decade. MSCI World ex USA more than doubled in local currency from January 2014 to early 2024, yet US holders banked only 64 percent. The emerging-markets index kept just 34.88 percent of a 75.06 percent local-currency run. Then 2025 flipped the sign: the US Dollar Index fell 9.4 percent over the calendar year. Moves of that size are not rounding error on an international ETF.

The dollar index rose sharply from 2014 to early 2024.

The dollar’s climb into early 2024 sat behind every unhedged international statement of that era. The thing is, that US baseline is one most readers already own through how to invest in S&P 500 ETFs, which makes the 46-point spread easy to feel.

The two paths in this table track the same stock indexes over the same window. The local currency path measures what the underlying markets returned in euros, yen, pounds, and other home currencies. The US dollar path measures what an American holder kept after every daily net asset value converted those returns into dollars. MSCI publishes both series for the same index, so the gap between them is pure currency translation with no difference in holdings, fees, or time period. A currency-hedged share class would approximate the local path minus an assumed annual implementation cost; the model below uses 0.30 percentage points. Figures use total return methodology from the cited MSCI and Bloomberg data; the source endpoints span 2014-01-01 to 2024-02-29.

📚 Source: MSCI via Avantis Investors, 2024 · avantisinvestors.com

Sources used in this article: NBER research, MSCI/Bloomberg index data via Avantis, IRS and Census data, issuer disclosures, Morningstar, and U.S. Bank. How source tiers work →

As U.S. Bank reported, the US Dollar Index fell 9.4 percent in 2025, a sharp calendar-year reversal.

📚 Source: U.S. Bank Asset Management, 2026 · usbank.com

The weak decade reframes as two numbers: 110.59 percent earned, 64 percent kept.

Wherever you stand, the first step is the same: find the currency line your statement does not print.

What does a decade of that translation add up to on one real-sized account?

The $163,177 Currency Gap on One Portfolio

Nuri’s modeled portfolio, a hypothetical composite, shows what the translation mechanism does to a real mid-career balance. Starting with $300,000 in January 2014 and adding $1,500 a month, the local-return path reached $850,607 in ten years. Measured in dollars, the same holdings over the same decade reached $687,430 instead. The difference came from currency translation alone, not from any single stock or fund choice. Divided by the $7,500 annual Roth IRA limit, that gap equals roughly 22 years of maxed contributions.

The index math showed the effect on public data. The same conversion now lands on Nuri’s $300,000 sleeve across ten years.

Nuri is a hypothetical composite drawn from common mid-career index-investor patterns. Not a real individual. Balance and income figures reflect typical retirement-account brackets.

I computed all twelve currency-drag scenarios in this article myself, in a Python notebook, from the MSCI endpoint data cited above. The model is deliberately simple: one path compounds at the blended local rate of 7.0567 percent, the other at the dollar rate of 4.4253 percent, with $1,500 added each month. Every milestone and sensitivity cell in these tables is the direct output of that notebook, logged with its formula, and the methodology page documents each assumption. I modeled the decade, not a trading rule, and nothing here forecasts the dollar’s next move.

Scene: early January 2026, after the dollar’s sharp 2025 decline. Nuri read the headline, opened the brokerage app, and tapped the 10Y button on the performance chart. Back in 2022 they had switched funds over a 0.05 percent expense ratio, a fix worth about $150 a year. The performance screen showed a single dollar figure, with no toggle to reveal the local-currency line sitting underneath it. The instinct is to guess low. Bottom line, the table lands an order of magnitude above that guess, and none of it traces to the stocks.

Anchoring on visible fund fees can make a $5,000 to $20,000 guess feel plausible. The model lands an order of magnitude above that range.

The table traces the same deposits along two paths, the local-currency return and the dollar return an American holder actually kept. Readers who want the raw mechanics can visualize compound interest on its own first.

Nuri pulls the decade view. The local index line: up $370,607. Their own line: up $207,430. Same stocks. Same decade. The gap reads $163,177. The dollar took it.

$163,177 divided by a year of median U.S. rent, about $17,800, equals roughly nine years of rent.

📚 Source: U.S. Census Bureau, 2024 ACS median gross rent · census.gov

📚 Source: IRS, 2026 contribution limits (IR-2025-111) · irs.gov

If you hold only developed markets, read the developed-only row. If your horizon is short, read the shorter-horizon row. For the hedged counterfactual, read the hedged row.

The hedged row is the counterfactual most readers assume erases the gap. It does not zero it out. The modeled gap shrinks to $20,366 because this scenario subtracts an assumed 0.30 percentage points a year for implementation. A real hedged ETF like HEFA or DBEF can also carry rollover and tracking-error drag.

If ten years cost this much, does hedging simply erase the gap?

Should You Hedge a Strong-Dollar International ETF?

Hedging looks like the obvious fix, so it is worth asking when it truly is.

Hedging looks like the obvious fix, and sometimes it genuinely wins. Morningstar found $10,000 in unhedged international stocks from January 2001 to September 2022 grew to $21,936, versus $23,968 hedged. Froot’s 1993 study found that over long horizons full hedging can raise return variance rather than lower it. The model assumes a 0.30-percentage-point annual implementation cost, and its hedged path still trailed local returns by $20,366. In 2025 the same currency force flipped, handing unhedged MSCI EAFE holders roughly a 7.5-point tailwind.

Hedged share classes like HEFA and DBEF do exist, but they generally cost more than broad unhedged counterparts. For example, HEFA listed a 0.35% net expense ratio while IEFA listed 0.07% in June 2026, a 0.28-point difference before any tax profile.

Does Hedging Beat the Unhedged Default?

Whether to hedge an international ETF depends on your horizon, not the headlines. From 2001 to 2022, Morningstar found hedged global ex-US stocks beat unhedged, 23,968 versus 21,936 dollars on 10,000. The trade-off is that hedged share classes usually carry a higher ongoing expense that compounds against you.

How to Check If Your Fund Is Hedged

Open your fund provider’s page and search the name for the word hedged. A currency-hedged share class says so explicitly, like the iShares Currency Hedged MSCI EAFE ETF, ticker HEFA. If that label is absent, you hold the unhedged default and carry the entire currency line yourself.

When Hedging Actually Makes Sense

Hedging an international ETF makes the strongest case when the horizon is short enough that the investor cannot wait through a currency cycle, or when the sleeve is bond-heavy and currency swings can swamp a thin yield. Du and Huber found institutional dollar-hedging demand reached about 2 trillion dollars by 2019. And how bonds work shapes how much that thin yield can absorb.

None of this makes hedging a mistake. There is a real argument for it, and it deserves a fair hearing before the decision. In shorter windows a currency swing has no time to reverse, so a hedge removes a risk the holder cannot wait out. Kenneth Froot, a Harvard Business School economist, showed that hedge ratios interact with horizon in ways that are easy to get wrong. Over the very long run his work found that fully hedging can raise return variance rather than lower it, which cuts against reflexive hedging. The honest reading sits in the middle. A hedge is insurance with a premium, useful when the timing risk is real and wasteful when it is not. Plus, the premium compounds: even a few tenths of a percentage point is small on one statement and heavy across a decade. The question is never whether hedging can win. It is whether your horizon and your sleeve make that premium worth paying.

📚 Source: Froot, 1993, Currency Hedging over Long Horizons (NBER w4355) · nber.org

📚 Source: Morningstar, 2001 to 2022 hedged vs unhedged · morningstar.com

Froot’s data ends in the early 1990s. What carries forward is the mean-reversion pattern he identified, not his exact hedge ratios.

Grab the Currency-Line Audit checklist to run these three steps on your own funds.

Next time an international fund lags, ask: how much was the currency column?

We will update these figures after the 2026 calendar-year MSCI local and USD returns publish.

Strong-Dollar International ETF FAQ

The questions below cover the checks investors actually run after a currency-heavy decade. They walk through how the translation works, what it can cost a portfolio, and whether hedged funds like HEFA earn their higher expense ratios. The short version is that the conversion happens daily and automatically inside the fund. The modeled decade cost ran to six figures, and hedging is a horizon call rather than a universal fix. Two answers lean on outside anchors: Morningstar’s 2001 to 2022 comparison and the IRS foreign tax credit rules for retirement accounts.

The Bottom Line on Strong-Dollar International ETFs

Nuri’s six-figure gap was never about stock picking, only about one currency line.

Strip the decade down and one mechanism explains the lag. Every unhedged fund converts foreign gains into dollars at the day’s rate, so the dollar cycle rides inside returns that look like stock performance. Obstfeld and Zhou put a measured share on that force, roughly a fifth of emerging-market swings, and the same arithmetic priced Nuri’s gap. The verdict belongs to the currency line, one layer below the fund names.

And the hedge compounds against you, the same way the drag did.

Open your international fund page today. Search the name for hedged. If absent: you hold the unhedged default.

The leak was not in your foreign stocks but in the exchange booth between their money and yours.

The decade did not indict international stocks. It priced the dollar’s climb into every unhedged statement, and Nuri’s modeled gap traces to that single conversion.

Your currency exposure is set by your asset allocation, audit that next.

Keep reading: The same compounding ledger runs through allocation, inflation, and the reflex to reach for gold.

• Your currency exposure starts one level up, in the allocation strategy basics that set the international weight.
• And the weight decision underneath all of it; whether going 100% US is a concentration bet or a diversified default, sets how much of this currency line you carry in the first place.
• From currency, the trail runs to the inflation gauges behind rate gaps, where CPI vs PCE inflation choices drive the differentials that move the dollar.
• And the hedge-audit thread continues with gold, testing whether is gold really an inflation hedge? tracks inflation any better than a currency overlay tracks the dollar.

In 2025 the spigot turned sharply, and the flow ran toward you.

Editorial transparency: This article was drafted with AI assistance and reviewed by Danny Hwang. All calculations were independently verified in Python (notebook available on request). All citations were manually checked against primary sources.

Educational quantitative analysis based on published data. Not investment, tax, or legal advice. Consult a licensed professional before acting on any calculation. About TheFinSense.