The one thing that remains certain in the stock market is uncertainty. It's full of highs, lows, bear markets, bull markets, and everything in between. You never know exactly when any of these will happen, but you can be confident they will happen eventually.

This year has seen a stronger stock market than many people were anticipating. Although the Dow Jones is relatively flat, the S 500 and Nasdaq Composite indexes are up about 10% and 25%, respectively, as of this writing.

Given these recent performances, it's natural for investors to begin wondering if the market is prepping for its next bull market. While I can't say when it'll happen, I can say that when it does, there's one expensive mistake you should avoid.

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Source Fool.com