"The first concerns how an investor should choose among different types of broad-based index funds. The best-known of the broad stock market mutual funds and ETFs in the United States track the S&P 500 index of the largest stocks. We prefer using a broader index that includes more smaller-company stocks, such as the Russell 3000 index or the Dow-Wilshire 5000 index. Funds that track these broader indexes are often referred to as "total stock market" index funds. More than 80 years of stock market history confirm that portfolios of smaller stocks have produced a higher rate of return than the return of the S&P 500 large-company index. While smaller companies are undoubtedly less stable and riskier than large firms, they are likely--on average--to produce somewhat higher future returns. Total stock market index funds are the better way for investors to benefit from the long-run growth of economic activity."