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How Online Flash Sales Hack Your Brain

The psychological reason we fall for lightning deals

Last year, on Amazon Prime Day, I filled my cart with tubes upon tubes of toothpaste.

“Well,” you might be thinking, “that’s not so bad. You’ll always need toothpaste.” Which might be true, if I’d been buying it for myself. But this was chicken-flavored toothpaste for my dogs — who…



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Kate Morgan

Kate is a freelance journalist who’s been published by Popular Science, The New York Times, USA Today, and many more. Read more at