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401k compound interest vs other compound interest
Growth in a 401k dodges taxes, which means more of the gains get reinvested. Effectively, it's a boosted return rate. Like any investment, a 401k can lose value. During the period before retirement, lower stock and bond prices actually help you buy more shares than you could if prices were high, so the real question is what the funds are doing at the time you start pulling money back out. That concern is why investors generally, not just 401k investors, should change their investment mix over time, to balance oossible risk against time to recover and possible reward.  And if your employer matches 401k contributions to any degree, that too improves your effective gains and buffers you against some of ghe risk. Hence the general advice that if you don't fund your 401k at least enough to max out the company match, you're leaving free money on the table.