Most of us would love to retire as millionaires -- and many of us who are aiming for a certain degree of comfort in retirement will need to retire as millionaires. After all, money tends to be worth less in the future, due to inflation. If you're retiring in, say, 30 years, with a million dollars, it may only have the purchasing power of $500,000 today.

So how should you invest to get to that million dollars (or more)? Well, it's hard to beat the stock market, of course, but you don't have to become a fancy stock analyst able to spot stocks that will be exploding in value shortly. You can reach millionairehood with a simple index fund that tracks the S&P 500.

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Source Fool.com