Key Points The S&P 500 is the best way to get overall exposure to the broader U.S. economy. Investing in mid- and small-cap stocks gives you exposure to the additional opportunities. A well-rounded portfolio should include international stocks, reflecting the global economy. 10 stocks we like better than Vanguard S&P 500 ETF › One of the key pillars of investing has always been diversification. It's like the old saying: "Never put all your eggs in one basket." This is particularly true when it co ...