Why are sales so hard to resist? Let's unravel this Black Friday mystery

Ahn Young-joon / Ahn Young-joon

If sales generally feel hard to resist, the sale in front of Aarron Schurevich was the ultimate test: a new Kia Soul just like the one he’d had and loved, at a dealership he trusted, at a moment when he really needed a car. And it was priced $4,000 off, more than a 20% discount.

“I figured that I would be an idiot not to to take advantage of that,” says Schurevich, a teacher from Omaha, Neb. “I’d better snatch this opportunity before it evaporates.”

After he sped through paperwork and drove the car off the lot, the deal turned sour. Bills arrived with hidden charges. The brand-new car quickly needed repairs. Schurevich now jokes that he paid a tax for being a fool.