It turns out, the U.S. is one of the least concentrated stock markets in the world

For all the talk about the Magnificent Seven and the ultra-reliance of just a handful of companies to drive stock-market returns, it turns out the U.S. is in fact one of the least concentrated markets in the world.

That’s according to the latest findings of the global investment returns yearbook, by Paul Marsh and Mike Staunton of London Business School and Elroy Dimson of Cambridge University, now being published at UBS after Credit Suisse’s untimely demise.

The U.S. — as represented by its largest stock (Microsoft), its largest three stocks (Apple and Nvidia are now 2 and 3), and its largest 10 stocks (the Magnificent 7 + Berkshire Hathaway, Eli Lilly, Broadcom and JPMorgan Chase) — is the second-least concentrated of the world’s 12 largest stock markets.

That’s not to say the current set up is necessarily sustainable. But the authors, on a call with journalists, were at pains to say that there’s nothing instrincially unstable. “The future is very uncertain, always,” said Dimson. “There’s no easy shortcut for spotting a bubble.”

“We’re not in a position to outguess markets,” added Marsh. He also drew a distinction between now and the dot-com era in that the current stock-market leaders are producing big profits, with the only real question being the price afforded to them. “The question is whether the price is too high, it’s not whether or not it’s a bunch of junk,” he said.

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The U.S. accounts for three-fifths of the global stock market.

The U.S. dominance of global stock markets is near, but not at its peak, representing 61% of total market capitalization at the end of last year.

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And the U.S. has been the best performing of the major stock markets over the last 124 years. After inflation, it’s generating returns of 6.5%. Globally, stocks over 124 years have generated an inflation-adjusted return of 5.1%, which is a 3.3% outperformance of bonds and a 4.7% outperformance of bills. Excluding the U.S., those returns have been 4.3% per year, after inflation.

They don’t think future returns will be so good, owing more to the luck of previous generations than worries about the future. They estimate Generation Z will see 4.5% annual real returns on stocks, 2% on bonds, and a 3.5% return on a 60/40 basis; that’s worse than what the baby boomers have experienced — 6.8% from stocks, 3% from bonds, 5.6% overall — but the same stock-market return that millennials have seen.

The market

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How is it that countries like Argentina, which has defaulted 9 times, can continually access capital markets? Check out this chart — again from the global investment returns yearbook — showing the return on sovereign bonds issued in foreign countries, since Waterloo in 1815. (That was an important date since Napoleon’s defeat set the stage for so many Latin American countries to become independent, and then to seek foreign capital.) The trio also estimated the credit premium on corporate bonds vs. government bonds dating back to 1900, which they say for investment-grade bonds is 0.75% per year.

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