Vanguard's founder John Bogle believed most actively managed funds and individual stocks couldn't beat the S&P 500 (SNPINDEX: ^GSPC) over the long run, so it was smarter to invest in the entire index. That's why Bogle launched the first S&P 500 index fund 50 years ago, and why he told investors to "just buy the haystack" instead of looking for individual needles. Since then, Vanguard has grown into the world's second-largest asset manager after BlackRock. It also offers a broader range of exchange-traded funds (ETFs) for domestic stocks, international stocks, bonds, and real estate investments. Should investors consider building a retirement portfolio with Vanguard's top ETFs in these four categories? Image source: Getty Images.
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