Global Stocks: Realistic Assessment of Long-Run Investment Returns

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In our previous article, The Biased History that Drives Excess Allocation to Equities, we discussed the idea that using US data as a proxy for overall market returns leads to an over-allocation to equities. Over the course of the past two centuries, the U.S. economy acquired a larger significance within the overall global economy. At the same time, its financial markets enjoyed a much larger success than that of most other countries.

One of the most frequently used charts and data points, when it comes to equity returns, comes from Jeremy Siegel. The chart below, from Stocks for the Long Run, shows the inflation-adjusted returns from U.S. equities, bonds, bills, gold, and the dollar.

Figure 1: Long run inflation-adjusted returns from U.S. stocks, bonds, bills, gold, and the dollar


Source: Jeremy Siegel, Stocks for the Long Run, 5th edition1

As we showed in the article referenced above, U.S. equities generated a 6.9% annualized inflation-adjusted return between 1870 and 2020. Indeed, across various time periods of 100-years plus length, U.S. equities have generated inflation-adjusted returns of 6%-7%. However, as we pointed out in that same article, using U.S. stocks as a proxy for global stock returns has an upward bias, as the U.S. stock markets have been one of the most successful markets of the past two centuries.