Investing doesn't have to be complicated. A simple portfolio of exchange-traded funds (ETFs) may be all you need to produce excellent returns over the long run.

Many people will allocate their entire stock portfolio to an S&P 500 or total stock market index fund. And while that can be a great foundation for any portfolio, history suggests investors will do well by tilting their holdings toward small-cap value stocks. That means putting more money in smaller companies trading at cheap valuations than you'd get by investing in a total stock market index fund.

The easiest way to achieve that goal is through an ETF, and one of the best in the space is the Vanguard S&P Small-Cap 600 Value ETF (NYSEMKT: VIOV). And right now may be an ideal opportunity to buy shares. Here are five reasons why.

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Source Fool.com