This single sentence could save you a lot of heartache

We are all hardwired to make stupid investment decisions, says John Stepek. But by remembering this simple manta, you could save yourself from making some very costly mistakes.

If there's one thing I've learned about investing (and life in general), it's that it's incredibly hard to learn from other people's mistakes.

I've been writing about finance and investment, and investing my own money, for well over a decade now. And I'd read plenty of books before I started putting my own cash into the stock market.

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John Stepek
Former editor, MoneyWeek