Frenzied buying almost never leads to smart shopping. One-day sales, midnight madness, and other sales techniques that spur quick decision-making tend to be disorienting and lead to over spending, says Kit Yarrow, consumer psychologist and author of coauthor of Gen BuY: How Tweens, Teens, and Twenty-Somethings Are Revolutionizing Retail. “They’re training [consumers] to purchase even though they may not be ready,” she says. “If people are buying for fear or anxiety that it won’t be available, then they’re less likely to make good purchasing decisions.”