(Money Magazine) — You’ve probably been told to keep things simple when it comes to managing your portfolio. And that’s typically good advice. Yet I’m reminded of that famous quote from Albert Einstein, who said, “Make everything as simple as possible — but not simpler.”

One way we oversimplify is by falling into the “bad industry” trap. Here, investors write off entire segments of the market, thinking it’s just too tough to generate good returns in certain industries.

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