What Style of Index Investing Is Right for You?

Find out what you need to know about index weightings before you invest.

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Above all, investors should understand what they're buying, Justice says. "When you're looking at ETFs, you've seen a lot of innovation over the last 10 years because you have to have an index in order to make an ETF," he says. "The concept of an index has really changed. Now you've created so many indexes it gets to the point these aren't things to measure the market anymore."

Twitter: @mmhandley