Is One Country Your Whole Stock Portfolio?

The S&P 500's calendar-year price returns from 2016 to 2025, dividends not included, were positive in 8 of 10 years and averaged +13.9% a year. Owning that was a lovely way to spend a decade. It is also the entire argument most people use to skip the rest of the planet, and it is a bad argument wearing a good suit.

What you actually need to answer is smaller and more personal: is one country your whole stock portfolio? If yes, you are not diversified, you are loyal. Owning the rest of the world is not a prediction about Japan or Europe. It is insurance against one country's long bad stretch, and it costs less than most people assume.

The winner always looks like the safe one

Home bias is the habit of owning the market you live in, read about, and hear argued about at dinner. It feels like common sense. Mostly it is proximity. You know the companies, you use the products, and the country's index has been the star of the only decade you happen to remember clearly.

That last part is the problem. Buying what already went up because it went up is performance chasing, and the cruel thing about it is that it feels like research. You looked at real numbers. You drew a conclusion. The numbers were a sample of one.

Try the same logic on anything else. Your favorite restaurant has never let you down, so you stop trying new ones for twenty years. It might work out. But you have not reduced your risk, you have concentrated it and called it taste. A portfolio with a passport that never gets used is not a sophisticated portfolio. It is a bet on one government, one central bank, one currency, and one set of rules.

Nothing guarantees the next decade rhymes with 2016 to 2025. That is the whole point.

A crash is loud. A lost decade is quiet.

Look at how the S&P 500 has actually fallen. From a close of $338.34 on Feb 19, 2020 to $222.95 on Mar 23, 2020, a drop of 34.1% in 33 days, and it was back to the old high 148 days after the bottom. In 2022 it fell 25.4% over 282 days and needed 464 days after the bottom to recover. In 2018 it dropped 20.2% over 95 days and was back 126 days after the bottom.

Notice what those three have in common besides pain: the recovery came, and it came in the same country that fell. That is the version of risk you can see, and it is the version that trains you to think a bad stretch is always temporary.

The version you cannot see is the one where the recovery does not arrive quickly. A market goes sideways for a decade. Not down 25% and back in a year and a half. Flat, boring, and long, while money elsewhere compounds. You would not notice that risk in a chart of the last ten years, because in the last ten years it did not happen to the winner.

Diversifying does not stop your stocks from falling. It stops one country's bad decade from being the whole story of your money.

The fee you fear is not the fee that hurts

The usual objection is cost. Why pay more for a fund that does worse?

Run the math on the version of this that actually matters. Start with $10,000, add $500 a month for 20 years, and earn 8% a year before fees. With a 0.05% yearly fee you end at about $341,000. With a 1% yearly fee you end at about $301,000. The higher fee costs you about $41,000. That is the expensive thing. A sliver of extra yearly cost for owning more of the world is not what breaks a plan; a full percentage point of fees is.

And notice how the money piles up. With no fee at all, the same plan ends at about $344,000. Only about $130,000 of that is money you put in. About $214,000 is growth. Fees are charged on the growth too, which is why a small-sounding percentage turns into a used car.

"My fund already owns the world"

Check. A fund can call itself total market and hold one country. A giant American company can earn money on every continent and still get sorted into the American bucket on the day that bucket is the problem. And if you stack three funds that all own the same biggest names, you have not diversified, you have bought the same thing three times.

Also expect a wrinkle: owning foreign stocks means the value of foreign money versus yours moves your returns too. Sometimes that helps, sometimes it does not. That is part of the insurance premium.

Your next step

Open your fund company's page for every stock fund you own and look at the holdings list. Write down the share of your stock money that sits outside your home country. If the answer is close to zero, pick a share of your stock money you can hold for twenty years without touching it, write it somewhere you will see it, and point new contributions there until you get there. Slow beats clever.

Do it inside your retirement accounts where you can. Do not pull money out of a traditional IRA or 401(k) to rearrange things: before age 59½ that usually means income tax plus a 10% penalty, with some exceptions.

Then leave it alone. The point of insurance is that you stop thinking about the thing you insured.