Most Investors Skip International ETFs. Math Says Why.

Let me say the quiet part out loud.

The case for international ETFs has been the investment equivalent of eating your vegetables for fifteen years. Everyone knows you’re supposed to do it. Financial advisors build it into model portfolios. Vanguard’s default target-date funds put 40% overseas. And the vast majority of retail investors just… don’t.

They skip it because the math has been brutal. If you bought the textbook international allocation in , you gave up massive returns to own a bunch of stocks that did almost nothing. U.S. mega-cap tech ran. International didn’t. That’s not bias — that’s what the chart shows.

But the setup is shifting. Tariff threats on semiconductors, China’s ultra-wealthy relocating capital, and a dollar that’s no longer in a straight line up — these aren’t headlines, they’re structural changes that make the case international exposure is worth reconsidering. Not because diversification is morally right, but because the opportunity cost might finally be flipping.

Why Did Everyone Stop Buying International in the First Place?

The numbers are ridiculous. Since , VOO (the Vanguard S&P 500 ETF) is up roughly +340% total return. VXUS (Vanguard’s total international stock ETF) is up around +75%. That’s not a rounding error. That’s a generational gap.

Home country bias — the tendency to overweight your own country’s stocks — used to be treated like a mistake. Academics would point to the U.S. being roughly 60% of global market cap and only half of global GDP, and tell you to spread your bets. But that advice quietly died because it cost people a fortune in foregone gains.

The S&P 500 had everything working: the world’s best tech companies, dollar strength (which crushes foreign returns when converted back to USD), and a regulatory environment that let buybacks and margin expansion run wild. Europe had austerity and energy dependence. China had crackdowns. Emerging markets had currency collapses.

So retail did the rational thing: they stopped diversifying and went all-in on what was working. The average U.S. investor now holds maybe 25% international — way below the global market-cap weight. Some hold zero. And for a long time, they were right.

What Changed? Trade Policy and Currency Aren’t Theoretical Anymore

The case international looks different now because the U.S. structural tailwinds are fraying. Tariff discussions on semiconductors — the backbone of U.S. tech dominance — put pressure on companies that rely on Asian supply chains. China’s wealthiest families are quietly shifting assets to Singapore, which redirects capital flows in ways that show up in EM equity performance months later.

And the dollar, which spent a decade grinding higher and crushing foreign returns, has started to wobble. When the dollar weakens even modestly, international stocks get a double tailwind: the local-currency gains and the favorable conversion back to USD. That’s the part most people forget when they look at raw index performance.

When the trade that worked for 15 years stops working, most investors notice six months too late.

None of this means international is suddenly the slam-dunk trade. It means the margin of safety for being 100% U.S. is thinner than it’s been in years. Diversification isn’t about getting rich — it’s about not getting wrecked when the thing everyone owns rolls over.

Which International ETFs Actually Make Sense?

If you’re going to tilt international, you need to know what you‘re buying. The broad stuff — VXUS, VEU, IXUS — gives you developed Europe, Japan, and emerging markets in one wrapper. Expense ratios sit around 0.07% to 0.09%. Clean, boring, globally diversified.

If you want to isolate regions, VEA covers developed markets ex-U.S. (think Europe and Japan), while VWO is pure emerging markets. Emerging carries higher volatility and political risk, but it’s also where you get actual growth in GDP terms. A “drawdown” just means how far something falls from its peak — and EM has had plenty of 30%+ drops in the past decade.

Then there’s the single-country stuff — EWJ for Japan, EWG for Germany, MCHI for China. These are higher-conviction bets, not diversification plays. If you think Japan’s corporate governance reforms or China’s tech rebound will drive alpha, fine. But you’re making a macro call, not buying the index.

ETF	Focus	Expense Ratio	5-Yr Annualized
VXUS	Total International	0.08%	~3.5%
VEA	Developed ex-U.S.	0.05%	~4.2%
VWO	Emerging Markets	0.08%	~2.1%
VOO	S&P 500 (U.S.)	0.03%	~14.8%

The performance gap is still enormous. But past returns don’t predict future ones, and that’s the whole point of the case international deserves a second look.

Does Currency Risk Kill the Entire Thesis?

Yes and no. Currency moves can erase equity gains or double them. If you own European stocks and the euro weakens against the dollar, your returns in USD terms get crushed — even if the stocks themselves go up in local terms. That’s not theoretical; it’s been the story for most of the 2010s.

But currency is a two-way street. When the dollar weakens — which happens during U.S. slowdowns, rate cuts, or fiscal blowouts — foreign stocks get a tailwind. The yen appreciates, the euro bounces, and your VXUS position suddenly looks a lot better. You can hedge currency exposure with ETFs like DBEF (hedged Europe) or HEWJ (hedged Japan), but you pay for it in higher expense ratios and you lose the potential upside when the dollar drops.

Most long-term holders just eat the currency risk. Over decades, it tends to wash out. Over three-year windows, it can dominate the return profile. Know which game you’re playing.

Should You Actually Allocate to International Now?

The case international makes sense isn’t “buy this now.” It’s “having zero international exposure in a portfolio is a bigger bet than most people realize.” You’re betting U.S. exceptionalism continues forever, that the dollar never weakens, and that geopolitical fragmentation doesn’t redirect capital flows.

That bet worked beautifully for fifteen years. It might work for fifteen more. But the margin of error is narrower when valuations are stretched, tariffs are live policy tools, and the rest of the world is trading at a discount to the S&P 500 that hasn’t been this wide since the dot-com bubble.

A reasonable approach for most people: 15% to 25% international, split between developed and emerging, rebalanced annually. Not because it’ll beat the S&P next year, but because it lowers the risk that a U.S.-only portfolio blows up when the macro tide shifts. Diversification isn’t about being right — it’s about not being catastrophically wrong.

The quiet part? Most investors will still skip it. They’ll wait until international has a monster year, pile in at the top, then bail when it underperforms again. The case international works best when you build it before it’s obvious, not after.

What’s the real downside of skipping international entirely?

You’re making a concentrated bet on U.S. outperformance continuing indefinitely. That worked from to now, adding roughly 260+ percentage points over VXUS. But if the dollar weakens or U.S. tech multiples compress, a 100% domestic portfolio has no cushion. Diversification limits upside, but it also limits the damage when one region rolls over hard.

Do emerging markets ever actually outperform?

Yes, but in bursts. From to , emerging markets crushed the S&P 500, driven by the China infrastructure boom and commodity supercycle. VWO returned over 150% in that window while the S&P did roughly 50%. The problem is the following decade gave it all back. Emerging works when global growth accelerates and the dollar weakens — conditions we haven’t had in fifteen years.

Is currency-hedged international worth the extra cost?

Only if you have a strong view that foreign equities will outperform but their currencies will weaken. Hedged ETFs like DBEF cost around 0.45% annually versus 0.07% for unhedged VEA. Over decades, that fee drag compounds. Most long-term investors skip the hedge and accept that currency will help sometimes and hurt others — it’s part of the diversification, not a bug.