Psychology says people may be willing to pay more when they can use a credit card; a real-auction experiment found higher bids under card payment than cash

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.

In a 2008 study, ‘Monopoly money: the effect of payment coupling and form on spending behavior,’ in the Journal of Experimental Psychology: Applied, marketing professors Priya Raghubir and Joydeep Srivastava found that people were willing to spend more just by seeing a credit card logo, even if no card was actually used in the transaction. Their research also found that this effect could be reduced when people were asked to estimate their expenses by breaking them down into individual parts instead of thinking about spending as a lump sum.

Not everyone feels the pinch in the same way
This “pain of paying” does not hit everyone equally. The study, ‘Tightwads and Spendthrifts,’ in the Journal of Consumer Research by Scott Rick, Cynthia Cryder and George Loewenstein found that people exist somewhere on a spectrum that the researchers called “tightwads” and “spendthrifts.” Tightwads feel more anticipatory discomfort before spending, even on things they really want, which causes them to spend less than they would like. Spendthrifts feel much less of that discomfort and tend to overspend. That same study also finds that when the pain of paying is reduced, for instance, when a purchase doesn’t feel so immediate or tangible, the spending gap between the two groups disappears.

What this means for your next purchase
For American consumers navigating a marketplace built around tap-to-pay, one-click checkout, and buy-now-pay-later options, this body of research offers a useful reminder. It can, by quietly reducing friction in the payment process, encourage higher spending even if that is not anyone’s intention. This doesn't mean credit cards are inherently harmful. They have real benefits, like rewards, fraud protection, and the ability to make big purchases without carrying cash. But the convenience that makes credit cards handy can also make it more difficult to keep track of how much is actually being spent.

A few practical habits may help. To restore some of that friction, consider using cash or a debit card for categories where you tend to overspend, such as eating out or online shopping. It can also create that moment of hesitation that cash would naturally provide when making larger purchases by adding in a brief pause. Tracking credit card spending in real time via a banking app, rather than waiting for the monthly statement, may help restore some of the immediacy that researchers associate with more mindful spending.

The bigger picture
It is worth being careful not to overstate what this research shows. The original 2001 auction was on a specific item in a specific setting, and the researchers themselves called for other work to understand the precise reasons for the effect. This doesn’t mean that credit cards make people reckless or that this applies to every purchase or every person. But coupled with later research into payment transparency and individual spending behaviors, it points to the payment method influencing how much someone is willing to spend, often without realizing it.

So next time you’re about to tap, swipe or click “buy now,” it might be worth asking yourself whether you would still want the item at that price if you were paying cash.