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An index fund is a fund that doesn’t try to beat the market; it simply buys everything in a market index, like the S&P 500’s five hundred large US companies or a total world stock index, and holds it at rock-bottom cost. One purchase gives you instant diversification across hundreds or thousands of companies.
Why settle for ‘average’? Because average turns out to be elite. Study after study finds that the large majority of professional fund managers fail to beat their index over long periods, largely because of fees and the near-impossibility of consistently predicting markets. Warren Buffett famously bet a million dollars that a simple S&P 500 index fund would beat a selection of hedge funds over ten years; the index fund won decisively, and Buffett has said index funds are the best choice for the vast majority of investors.
What to look for in practice: a broad index (total market or S&P 500 style), a very low expense ratio (well under 0.2 percent per year; many are under 0.05), and a strategy you can hold for decades. The standard beginner approach is dollar-cost averaging: investing a fixed amount automatically every month, in good markets and bad, which removes timing decisions entirely. Boring, automatic, diversified, cheap: that’s the whole miracle.