“Whenever I’m contemplating a purchase,” she says, “I spend 10 minutes thinking about it.” That’s the first roadblock—you have to actually consider why you want this thing. Then there’s a second review. “If I spend more than 10 minutes thinking about it, I look at the price,” Wong says. “If it’s $10 or less, I just buy it. If it’s more, it automatically goes back.” More often than not, she says, she ends up avoiding the purchase, because she doesn’t want to waste that 10-minute thinking period—and she knows that if she has to invoke the rule, it’s probably an unnecessary impulse purchase anyway. On the occasions she does give in, she only spent $10 or less, so it isn’t a budget killer.