Imagine yourself at a live auction, paddle in hand, adrenaline running high. Would you bid differently if you were paying cash, rather than swiping a card? According to a 2001 study, ‘Always Leave Home Without It: A Further Investigation of the Credit-Card Effect on Willingness to Pay,’ published in Marketing Letters by MIT Sloan School of Management professors Drazen Prelec and Duncan Simester, the answer is yes, and the gap between what people are willing to pay can be significant.
The experiment that started it all
Prelec and Simester set up a real-money auction for a highly desirable item: tickets to a Boston Celtics basketball game. This was not a hypothetical survey. People bid real dollars for real seats. Half the group was told they would pay in cash if they won. The other half were told they would pay with a credit card, but neither group knew the other condition existed.
In the same study, bids from the credit-card group were, on average, almost twice as high as bids from the cash group, and the difference remained after the authors controlled for participants’ income and credit-card ownership. The gap didn’t seem to be simply about a lack of liquidity, researchers said. In other words, it wasn’t just that cash bidders had less to spend. There was something about the card itself that changed how people valued the purchase.
Why does a piece of plastic change the math
So what’s happening psychologically? One popular explanation comes from behavioral researchers who study the “pain of paying,” the discomfort we feel when money leaves our hands in visible ways. Cash makes that moment immediate, real. A credit card delays it, both because the bill arrives weeks later and because a swipe or tap doesn't register the same way as counting out bills.
