Over-reacting to the news can poison your portfolio and sour your life. Here’s how to keep your investment plan on track.

I just pulled a Rip Van Winkle—and maybe you should, too.

I’m back at my regular post at The Wall Street Journal after being away on book leave. That long hiatus disengaged me from the daily hubbub of markets so I could frame investing ideas in a longer historical and broader psychological perspective.

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