Exchange-traded funds (ETFs) are great investment vehicles for gaining instant exposure to different sectors at prices often lower than those of some of the ETF's top stock holdings.For example, Space Exploration Technologies, or SpaceX, closed its first day of trading at just under $161. But the Tema Space Innovators ETF, which holds SpaceX and other space-related investments, is trading below $35 per share.That said, with so many different options to choose from, there's one key question to consider before adding the first ETF into any portfolio.The question to answer before buying an ETF is...
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