Is the S&P 500 All You Need to Retire a Millionaire?
Investing steadily in an S&P 500 index fund is one of the simplest and most effective ways to accumulate wealth. Starting early and consistently putting money into a low-fee broad-market index fund can put you on course to own a $1 million portfolio one day.
But when you're investing for retirement, you should also diversify your portfolio across asset classes in order to ensure your money is there when you need it.
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Source Fool.com
