10 tricks for better investing

Why do smart people do such stupid things with their money? Because, research shows, financial decisions are driven by feelings. Here's how to keep your impulses in check.

Never say always
No matter how sure you are that an investment is a winner, don't put more than 10% of your portfolio in it. If you turn out to be right, you'll still make plenty of money, but if you turn out to be wrong, you'll be glad you kept most of your powder dry.
Last updated January 02 2008: 8:29 AM ET

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