We’ve all been tempted. Whether there’s a hot new sector that seems to be on fire, or a classic U.S. company that seems poised for a new burst of life, or, worse, a pundit who keeps warning us not to get caught flat-footed.

It’s human nature to be attracted to the next shiny new thing. My 2-year old son was perfectly happy playing with his trusty push truck, for instance, until he got a shiny red Matchbox car for his birthday and abandoned the – still very serviceable – truck.

It’s also human nature to try to catch winners on the way up and want to abandon the underperformers. But that doesn’t mean it’s always a good idea.

While the market as a whole has done quite well over the last 20 years – the S&P 500 has returned approximately 9.9%, and a diversified portfolio of 60% stocks and 40% bonds would have returned 8.7% [1]– the same can’t be said for the average investor.

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