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These outdated beliefs sound smart, but they could be silently draining your wallet. Here’s what to stop believing — and what to do instead.

Advertising Disclosure: When you buy something by clicking links within this article, we may earn a small commission, but it never affects the products or services we recommend. We all want to be sensible with our money. But what if the “rules” you’ve been following are actually sabotaging your budget? Personal finance is packed with conventional wisdom that hasn’t aged well.