If you had invested $1,000 in an ETF tracking S&P 500 Index on Jan. 1, 2010—perhaps the simplest and most prudent decision, given the rise in passive investing in the 2010s—you'd be celebrating a return of $5,104 for your patience. Just place your cash into an index fund and then forget it for 10 years—this simple strategy would have produced far from meager returns.

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