Most of the attention in the stock market goes to the largest companies: large-cap stocks, some of which are worth more than $1 trillion. The S&P 500 index is a great way to buy the 500 largest U.S. For the past 10 years, S&P 500 exchange-traded funds (ETFs) like the Vanguard S&P 500 ETF have delivered annualized returns of about 15. 3%.
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