If you opened a brokerage account in the last ten years and bought whatever did best, you bought US stocks. That instinct has been rewarded so consistently that a lot of people now treat international stocks as a quaint relic, the financial equivalent of a landline. Why own slow-growing companies in Europe or Japan when American technology giants keep climbing? It is a fair question, and the honest answer is more interesting than either side of the usual argument. The United States is genuinely the biggest and most dynamic stock market on Earth. It is also only part of the world, and the part that wins changes more often than a decade of memory suggests. This guide walks through how the global market is actually split, what history says about US versus international returns, why diversification still earns its keep, and how to choose a split you can actually live with for thirty years.
Start with a number that surprises almost everyone. As of 2026, the United States makes up roughly 60 to 65 percent of the total value of the world's investable stock market. That is an enormous share for a single country, far larger than its share of the global population or even its share of global economic output. American companies, especially the largest technology firms, have grown so much that they tower over the rest of the world by market value.
But flip the number around. If the US is about 60 to 65 percent, then the rest of the world is about 35 to 40 percent. That is not a rounding error. That is more than a third of all the publicly traded company value on the planet, spread across thousands of businesses in Europe, Japan, Canada, Australia, China, India, Taiwan, Brazil, and dozens of other markets. Some of these are household names you would recognize instantly. Many are giants in their industries with no US-listed equivalent at all.
When people say they want to own "the whole market," a total US index fund does not actually do that. It owns the whole US market, which is a different thing. Owning the whole world means holding that international third as well. Whether you should is the real question, and the case runs in both directions.
International stocks are not one undifferentiated blob. They divide into two broad groups, and the distinction matters for how you think about risk and return.
The first group is developed markets. These are wealthy, stable economies with mature financial systems and strong investor protections. Think Japan, the United Kingdom, Canada, Germany, France, Switzerland, Australia, and the rest of Western Europe. Developed international markets make up the larger share of the non-US world. They tend to behave somewhat like the US market, just with their own currencies, sector mixes, and valuations layered on top.
The second group is emerging markets. These are fast-growing but less mature economies, including China, India, Taiwan, Brazil, South Korea, and many others. Emerging markets are a smaller slice of the global total, often in the neighborhood of a tenth of the world stock market, and they tend to swing harder in both directions. A good year can be spectacular and a bad year can be brutal. The growth story is compelling on paper, but it comes with more political risk, more currency risk, and bigger price swings.
Here is the practical part. You do not have to assemble these pieces by hand. A single total international stock fund typically holds both developed and emerging markets, weighted by size, so one purchase covers the entire non-US world. That is how most people get international exposure, and it is why the decision really comes down to one number: how much of your stock money goes abroad.
Let us take the skeptics seriously, because their argument is not silly. Over the last fifteen years or so, US stocks have meaningfully outperformed international stocks. Someone who ignored the rest of the world and held only US index funds did better than someone who diversified globally. That is not a small detail. It is a long stretch, long enough that an entire generation of investors has never seen international stocks lead.
The skeptic adds a second point that sounds convincing. Many of the largest US companies earn a huge share of their revenue overseas. A US technology giant or consumer brand might make half its money outside the country. So, the argument goes, you already have global exposure through American companies, and buying foreign stocks directly is redundant.
There is truth in both points, and it would be dishonest to wave them away. US markets have been the place to be, and large US firms genuinely do business everywhere. If the next fifteen years look exactly like the last fifteen, skipping international will have been the right call. The trouble is that nobody gets to see the next fifteen years in advance, and the assumption that they will rhyme with the recent past is exactly the assumption that has burned investors before.
Now the other side, which rests less on prediction and more on humility. The core idea of diversification is that you spread your money across things that do not all move together, so that no single bet can sink you. Regulators and researchers describe it the same way: diversification does not promise higher returns, but it reduces the risk of any one market dragging your whole portfolio down.
The revenue argument has a hidden flaw. Yes, a US company might earn money abroad, but its stock price still trades on US valuations, in US dollars, under US accounting and US policy. When American stocks get expensive relative to history, you are exposed to that expensiveness no matter where the underlying revenue comes from. Owning international stocks directly gives you something different: companies priced in other currencies, on other valuation levels, driven by other economies. That is genuine diversification, not the borrowed kind.
Then there is the matter of starting valuations. For much of the recent past, international stocks have been cheaper than US stocks on common measures like price relative to earnings. Cheaper starting points do not guarantee better future returns, but over long horizons they have historically tilted the odds. A lower price for the same stream of earnings is, all else equal, a better deal. Part of what powered US outperformance was valuations expanding, and valuations cannot expand forever.
Finally, currency. US stocks are priced in dollars, and the dollar has been strong for years. A strong dollar quietly hurts the returns a US investor earns on foreign stocks, because gains in euros or yen translate back into fewer dollars. That works in reverse too. If the dollar weakens, international returns for a US investor get a tailwind. Holding international stocks means you are not betting your entire future on the dollar staying strong forever.
The single most useful fact in this whole debate is that leadership flips. US stocks and international stocks have traded the lead back and forth in long, multi-year cycles, and the cycles are long enough to convince people that the current leader will lead forever, right before it stops.
Consider the broad shape of the last few decades. Through much of the 2000s, international stocks, especially emerging markets, outpaced US stocks. An investor who went all-in on the US in the year 2000 endured a frustrating stretch where the rest of the world did better. Then the script flipped. From roughly the early 2010s onward, US stocks, lifted by their technology giants, pulled sharply ahead and stayed there. Each era felt permanent while it was happening.
This is the heart of the matter. The reason to hold both is not that international stocks are about to win. Nobody knows that. The reason is that you cannot reliably predict which will win, and holding both means you always own the winner. You give up the thrill of being all-in on the right horse, and in exchange you remove the risk of being all-in on the wrong one. For money you need to grow over decades, that trade is often worth making.
There is a well-documented pattern in investing called home bias. Investors in every country tend to hold far more of their own nation's stocks than that nation's share of the global market would justify. Japanese investors overweight Japan, British investors overweight Britain, and American investors overweight America. It is a near-universal human tendency, driven by familiarity, comfort, and the simple fact that home companies feel more knowable.
A modest home bias is perfectly reasonable. You spend your money in dollars, so holding extra US stocks roughly matches your future expenses to your investments. US funds can also carry slightly lower costs and simpler tax treatment for a US investor. Nobody is suggesting you hold international stocks at exactly their global weight and not a percentage point more. A tilt toward home is defensible.
The danger is degree. There is a difference between a gentle home tilt and holding zero international stocks at all. The first is a reasonable preference. The second is a concentrated bet that one country, one currency, and one set of valuations will keep leading the world indefinitely. Recognizing home bias for what it is helps you make that choice on purpose rather than by accident.
Here is where theory meets a real decision. There is no official, regulator-blessed answer, and anyone who gives you a precise number with total confidence is overselling. What exists instead is a sensible range, and a few common approaches within it.
The first approach is market-cap weight. You hold US and international stocks in the same proportions as the global market, which in 2026 means roughly 60 to 65 percent US and 35 to 40 percent international. The appeal is intellectual honesty. You are not betting on any country. You are simply owning the world as the market prices it, and letting the weights shift naturally as markets move. A single total world stock fund does this automatically.
The second approach is a moderate tilt toward home, the most common real-world choice. Many investors hold something like 20 to 30 percent of their stocks internationally rather than the full global weight. This captures most of the diversification benefit while keeping a comfortable home bias. Some large fund providers have historically suggested that holding at least 20 percent international captures a meaningful share of the diversification value, with diminishing extra benefit beyond roughly 40 percent.
The third approach is all-US, zero international. This is the bet that US dominance continues. It is simple, it has worked recently, and it is not crazy. But it is a concentrated position, and it is worth holding only if you understand that you are choosing to forgo a third of the global market and the diversification it brings.
Notice what all of this implies. The realistic decision is not between zero and a hundred. It is choosing a number between zero and roughly forty percent international, and then leaving it there. Most of the disagreement among reasonable people lives inside that narrow band.
Here is the part that gets lost in the endless US-versus-international arguments. Whether you choose 20 percent international or 35 percent international matters far less than whether you can hold your choice through the years when it looks wrong.
Every allocation goes through a stretch where it underperforms some other allocation. If you pick a global market weight, you will spend years watching the all-US crowd brag. If you pick all-US, you will eventually hit a decade where international leads and you wish you had diversified. The investor who quietly destroys their own returns is the one who switches strategies at the worst possible moment, chasing whatever just won. They buy US after it has soared, then bail to international right before US recovers, then flip back again, always one step behind.
This is why the boring advice is the right advice. Pick a split you genuinely believe you can hold for ten or twenty years without flinching, write it down, and rebalance back to it occasionally rather than abandoning it. A merely decent allocation held faithfully beats a brilliant allocation abandoned at the first rough patch. Consistency compounds. Second-guessing does not.
The good news is that acting on any of this is genuinely simple, and you do not need to buy foreign shares one at a time. Two clean paths cover almost everyone.
The first path is a single total world stock fund. One fund holds US and international stocks together at roughly global market weights, automatically including developed and emerging markets. You buy one thing, you own the planet, and the weights adjust themselves as markets move. It is about as low-maintenance as investing gets, and it sidesteps the temptation to tinker with your split.
The second path is two funds: a total US stock fund plus a total international stock fund. This takes one extra step but gives you control over the split. Want 30 percent international? Put 70 percent of your stock money in the US fund and 30 percent in the international fund, then nudge it back toward those weights every year or so. Many investors prefer this because it lets them choose their own home bias deliberately rather than accepting the global default. If you are choosing where to open an account to do this, you might compare options at {{AFF_LINK_BROKERAGE}}.
Either way, the heavy lifting is done by broad, low-cost index funds that hold thousands of companies at once. You are not picking foreign stocks or guessing which country wins next year. You are deciding, once, how much of the world outside the US you want to own, and then letting time do the rest.
The United States is the largest stock market in the world, making up roughly 60 to 65 percent of global value in 2026, and it has been a wonderful place to invest for over a decade. None of that tells you what the next decade holds. International stocks are not a relic. They are more than a third of the investable world, priced in different currencies, on different valuations, driven by different economies, and historically they have taken the lead often enough to make ignoring them a real gamble. There is no perfect split. Owning the world at market weight is honest, a moderate home tilt of 20 to 30 percent international is common and reasonable, and going all-US is a defensible bet as long as you know it is a bet. What matters more than the exact percentage is picking one you can hold through the inevitable years it looks wrong, and then having the discipline to leave it alone. Choose your number, build it with one or two index funds, and let consistency do the work that forecasting never can.
The market charges tuition for every gap in your knowledge. The Financial IQ Test measures what you actually know across investing, banking, credit, and retirement, then shows you exactly which gaps to close before they get expensive.
Test your Financial IQThere is no official answer, but the common range runs from zero to roughly 40 percent of your stock holdings. Holding around the global market weight, which is about 35 to 40 percent international in 2026, means you own the world in the proportions the market actually prices it. Many investors land somewhere between 20 and 40 percent because it captures most of the diversification benefit while keeping things simple. The most important thing is choosing a number you can stick with for decades.
A few forces stacked up over the last decade and a half. US markets are heavy in large technology companies that grew enormously, the dollar was strong, and US company valuations expanded faster than those abroad. Those same factors can reverse. A weaker dollar, cheaper starting valuations overseas, or a shift in which sectors lead can all tilt returns the other way. Long stretches of international outperformance have happened before, including much of the 2000s.
It is true that many large US companies earn a big share of their revenue abroad, so you get some global exposure through them. But that is not the same as diversification. You are still exposed to US valuations, US accounting, the dollar, and US policy. Owning international stocks directly adds companies, currencies, and economies that US firms do not represent, like many large European, Japanese, and emerging market businesses with no US-listed equivalent.
Home bias is the tendency to hold far more of your own country's stocks than its share of the global market would suggest. It is extremely common everywhere, not just in the United States. A modest home bias is reasonable because you spend in your home currency and it can lower costs and taxes. The risk is overdoing it, since a heavy tilt to one country ties your future to a single economy and currency rather than the whole world.
Yes. International stocks are usually split into developed markets, which include places like Japan, the United Kingdom, Canada, and much of Europe, and emerging markets, which include countries like China, India, Brazil, and Taiwan. A total international index fund typically holds both, weighted by size. Emerging markets are a smaller slice of the global total and tend to swing harder, both up and down, than developed markets.
Most people use a single low-cost index fund or ETF that holds a broad basket of international companies, rather than buying foreign shares one at a time. A total international stock fund covers developed and emerging markets in one holding. Alternatively, a total world fund bundles US and international together at global market weights, so one fund does the whole job. Both approaches are available inside most brokerage and retirement accounts.
One smart money idea each week, charts included. Join free and get the printable 2026 Money Calendar in your welcome email.
