It's hard to beat a low-fee, broad-market index fund for long-term growth.

Is the Vanguard S&P 500 ETF ( VOO 0.49% ) a buy now? I think it is. Let's take a closer look at the S&P 500 index and the Vanguard exchange-traded fund (ETF) that tracks it.

Even Warren Buffett is a fan of the Vanguard S&P 500 ETF, writing in his 2013 letter to shareholders:

One bequest provides that cash will be delivered to a trustee for my wife's benefit. ... My advice to the trustee could not be more simple: Put 10% of the cash in short-term government bonds and 90% in a very low-cost S&P 500 index fund. (I suggest Vanguard's.) I believe the trust's long-term results from this policy will be superior to those attained by most investors -- whether pension funds, institutions or individuals -- who emp

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