Why Should You Diversify?

When international stock returns lag, investors may feel tempted to double down on their home market. Historical data suggests the long-term benefits of diversifying globally.

With US stocks outperforming non-US stocks in recent years, some investors have again turned their attention toward the role that global diversification plays in their portfolios. In the five-year period ending March 31, 2020, the S&P 500 Index had an annualized return of 6.73%, while the S&P Developed Ex-US BMI (broad market index) lost 0.05% and the S&P Emerging BMI added 0.07%.

While there may be reasons why US-based investors would prefer a degree of home bias in their equity allocation, using return differences over a relatively short period as the sole input into this decision may result in missing opportunities that the global markets offer. It is important to remember that:

1) Non-US stocks help provide valuable diversification benefits.

2) Recent performance is not a reliable indicator of future returns.

There’s a World of Opportunity in Equities

The global equity market is large and represents a world of investment opportunities. As shown in Exhibit 1, nearly half of the investment opportunities in global equity markets lie outside the US. Non-US stocks, including developed and emerging markets, account for 46% of world market capitalization1 and represent thousands of companies in countries all over the world. A portfolio investing solely within the US would not capture the performance of those markets.

The Lost Decade

Recent history provides us with a valuable lesson on the importance of diversifying globally. The period from January 2000 to December 2009 is often called the “lost decade” by US investors, as the S&P 500 Index recorded one of its worst 10-year performances with a total cumulative return of    –9.1%. However, looking beyond US equities, conditions were more favorable for global equity investors as major indexes outside the US generated positive returns over the course of the decade (see Exhibit 2.)

1 2
View single page >> |

Dimensional Fund Advisors LP is an investment advisor registered with the Securities and Exchange Commission.

Indices are not available for direct investment. Their performance does not reflect ...

How did you like this article? Let us know so we can better customize your reading experience.


Leave a comment to automatically be entered into our contest to win a free Echo Show.