What if the stock market crashes tomorrow? It's a question worth asking, especially when investors worry that high valuations, enthusiasm for artificial intelligence, or economic uncertainty could trigger a sharp sell-off. History has repeatedly shown that the S&P 500 (SNPINDEX: ^GSPC) can fall 20% or more from a recent high during a bear market, and individual stocks can suffer much steeper losses. Nobody knows when the next crash will happen. But you don't need to predict it to prepare for one. In fact, the best time to prepare for a market crash is before it happens, when you can still make decisions calmly rather than react out of fear.
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