Latest / Behavioral Economics with Fexingo: Decision Making, Bias, and How People Really Spend / Why You Feel Cash Differently Than Credit
Transcript
- Lucas: Luna, I want to start with a simple question. When you buy something, does it matter whether you pay with cash, a credit card, or your phone? Luna: I'd like to say no, but I know where this is going. I definitely spend more freely with a card. Lucas: Most people do. And the data is striking. A 2020 study from the University of Pennsylvania found that people spend between 12 and 83 percent more when paying with credit cards compared to cash for the exact same items. Luna: Eighty-three percent — that's not a rounding error. That's nearly double. Lucas: Right. And the effect holds across categories — groceries, electronics, clothing. The form of payment literally changes how much we're willing to part with. Luna: So what's the mechanism? Why does plastic feel different than paper? Lucas: It comes down to what researchers call the 'pain of paying.' Cash is tangible — you hand over physical notes, you see your wallet get thinner. That creates a real sense of loss. Credit cards abstract the transaction. You swipe, you sign, the pain is delayed. Luna: Delayed and diluted. It's not zero, but it's muffled. Lucas: Exactly. And the more frictionless the payment, the less painful it feels. That's why digital wallets like Apple Pay and Google Pay amplify the effect even further. One thumbprint and you're done. Luna: So we're basically designing our way into spending more. Every innovation in payments makes it easier to ignore the cost. Lucas: Precisely. And this isn't just a credit card thing. A 2022 study in the Journal of Consumer Research looked at buy now pay later services like Klarna and Afterpay. They found that splitting a purchase into four interest-free installments reduced the perceived cost by about 30 percent. Luna: Because each payment feels smaller, even though the total is the same. Lucas: Right. The brain treats each installment as a separate, minor loss rather than one big hit. That framing makes people willing to buy more expensive items than they would with a single payment. Luna: So it's a kind of installment illusion. The total cost is hidden behind the smaller numbers. Lucas: Exactly. And the form of payment effect is so powerful that it even works with gift cards. People consistently spend more with a gift card than with cash of the same value, because the gift card doesn't feel like 'real' money. Luna: I've done that. I got a $50 gift card to a bookstore and left with three hardcovers I never would have bought with cash. Lucas: That's the mental accounting at work. We put gift cards in a 'fun money' bucket, while cash goes into the 'real expenses' bucket. The brain is terrible at treating all dollars as equal. Luna: Which is exactly why behavioral economists say we should use cash more deliberately. If you want to control spending, make it hurt. Lucas: There's a famous experiment from the late 1990s by Drazen Prelec and Duncan Simester at MIT. They auctioned off tickets to a Celtics game. Half the bidders were told they had to pay cash, half could use credit. The credit group bid more than twice as much on average. Luna: Two times. For the exact same ticket. Lucas: Yes. And this was before anyone had ever heard of Apple Pay. The effect is fundamental to how we process transactions. Luna: So what should a listener do about this today? I mean, we can't go back to a cash-only world. Lucas: No, and you don't have to. But awareness itself is a tool. The first step is simply recognizing that the payment method biases your spending. Then you can build small friction into your system. Luna: Like what? Give me a concrete example. Lucas: One technique is the '30-second rule.' Before you tap your phone or swipe a card, pause for thirty seconds. Ask yourself: 'If I had to pay cash for this right now, would I still buy it?' That reframes the transaction. Luna: I like that. It forces you to imagine the pain. Lucas: Another approach is to use a separate debit card for discretionary spending and load it with a fixed amount each week. When it's gone, it's gone. That creates a hard budget with a tangible limit. Luna: So you're basically recreating the envelope system digitally. Lucas: Exactly. And for buy now pay later, a good rule is to only use it for planned purchases — never for impulse buys. If you see something and think 'I'll just Klarna it,' that's a red flag. Luna: Because by then the brain has already discounted the cost. Lucas: Right. And the installment illusion makes it feel like a great deal, when really you're just borrowing from your future self. Luna: I also wonder about the rise of cryptocurrencies and stablecoins. Do they have the same effect? Lucas: Early evidence suggests they might be even worse. A 2023 study in Nature Human Behaviour found that people spending Bitcoin treated it like 'play money' — they were willing to overpay for goods by about 20 percent compared to cash. Luna: So the more abstract the asset, the less it hurts to spend it. Lucas: Exactly. And that's the core insight of the form of payment effect. The brain doesn't process all money equally. The medium shapes the meaning. Luna: It's a great reminder that our financial decisions aren't purely rational. The tool we use to pay is part of the decision itself. Lucas: And that's worth keeping in mind as payments get faster and more invisible. The easier it is to spend, the harder it is to save. Luna: Hey, speaking of things that are worth it — if today's episode made something click for you, there's a simple way to support the show. If it was worth a coffee to you, that's the link: buy me a coffee dot com slash fexingo. Lucas: Yeah, genuinely. Listener support is what keeps this show ad-free and focused on the research. Just a small gesture from people who find value here. Luna: Exactly. And now back to the topic — because I want to ask you about one more experiment. I read about a study where they gave people a 'pain of paying' scale. What did that show? Lucas: Oh, that's a good one. Researchers had participants rate how much it hurt to spend money in different ways. Cash was always the most painful, followed by debit, then credit, then digital wallet. The more steps between you and the money, the less you feel the loss. Luna: So if you want to spend less, add steps. Use cash, use a separate card, or just pause. Lucas: Right. The takeaway isn't that credit cards are evil. It's that the medium of exchange isn't neutral. It changes our perception of value. And once you see that, you can design your own spending environment to work with your brain, not against it. Luna: That's a good note to end on. Because ultimately, the goal isn't to deprive yourself — it's to make sure your spending matches what you actually value. Lucas: Exactly. And that's the real power of understanding this bias. It's not about being perfect. It's about being aware.