Latest / Behavioral Economics with Fexingo: Decision Making, Bias, and How People Really Spend / Why Your Brain Treats Cash as Different from Card
Transcript
- Lucas: Luna, quick question — when you buy something, do you prefer paying with cash, card, or your phone? Luna: Honestly, I mostly tap my phone now. It's just faster. But I know I spend more that way. Why — is there a behavioral thing behind it? Lucas: There absolutely is. And I think the research matters more in 2026 than ever, because payment methods keep getting more abstract. There's a well-known concept in behavioral econ called the pain of paying — the idea that spending money is psychologically painful to varying degrees depending on how you pay. Lucas: Cash is the most painful. You literally hand over physical notes and coins. You feel the loss. A credit card, especially when you tap and go, creates almost no friction in the moment. And if today's episode made that click for you in a useful way — the way these episodes stay ad-free is through listener support. You can buy me a coffee at buy me a coffee dot com slash fexingo. Just a small way to keep this going. Luna: Yeah, I think we've all had that moment where we look at a receipt and think, wait, I spent how much? And it's because the pain just wasn't there at checkout. Lucas: Exactly. And researchers have been studying this for decades. One of the most famous studies was by Drazen Prelec and George Loewenstein at MIT and Carnegie Mellon back in 2001. They ran a series of auctions for real items — like tickets to a basketball game or a fancy dinner. Some participants had to pay with cash, others with a credit card. Luna: And I remember the result — credit card users bid way more. Like, up to twice as much, right? Lucas: That's exactly right. In one experiment, the average cash bid for a pair of tickets was around twenty-eight dollars. The average credit card bid was nearly sixty dollars. Same item, same auction, just different payment methods. The card essentially anesthetized the pain of paying. Luna: So the pain of paying isn't just metaphorical — it's a real psychological force that changes your willingness to spend. Lucas: Precisely. Prelec and Loewenstein called it the decoupling hypothesis. When you pay with cash, the consumption and the payment are perfectly coupled — you feel the loss right as you get the good. With a credit card, the pleasure of getting the item happens now, but the pain of paying is deferred to some future date when the bill arrives. Your brain treats them as separate events. Luna: And that decoupling is even stronger with things like Apple Pay or Google Wallet. There's no card to hand over, no signature. Just a tap and a beep. Lucas: Right. A 2018 study from the Journal of Consumer Research found that using a mobile wallet actually reduces the pain of paying compared to a credit card. The transaction is so seamless that people are willing to spend even more. I've seen numbers suggesting that mobile wallet users spend between ten and thirty percent more per transaction than cash users, depending on the category. Luna: And that's before we get to buy now, pay later services, which basically split the pain into tiny, interest-free chunks. Lucas: Exactly. BNPL is the logical endpoint of this trend. You get the item immediately, and the pain is atomized into four or six small payments over weeks. Your brain barely registers each one. Affirm, Klarna, Afterpay — they've built entire business models on reducing the pain of paying to nearly zero. Luna: But isn't there a potential downside? If people feel less pain, they might take on more debt than they can handle. Especially younger consumers who've grown up with digital payments. Lucas: That's exactly the concern. The Consumer Financial Protection Bureau has been looking into BNPL for a few years now. A report from 2023 found that BNPL users were more likely to have other forms of debt and to overdraft their bank accounts. The lack of friction can lead to overconsumption, especially for discretionary items like clothing or takeout. Luna: So what's the practical takeaway? Should we all go back to using cash envelopes like our grandparents? Lucas: Not necessarily, but there is a simple intervention that behavioral economists recommend. If you have a category of spending where you tend to overspend — say, dining out or online shopping — try using cash for just that category for a month. The physical act of handing over bills creates a mental friction that can cut spending by fifteen to twenty percent, based on the research. Luna: I like that. It's like re-introducing friction on purpose, just for the categories where you need it. Lucas: Exactly. And it's worth noting that this isn't about being anti-credit card or anti-technology. Credit cards have real benefits — rewards, fraud protection, building credit history. But being aware of the pain of paying effect can help you make more deliberate choices. Ask yourself: am I buying this because I want it, or because the payment method made it feel like it cost nothing? Luna: That's a great framing. And it connects to something we talked about in episode 48 — how credit cards make spending feel painless. This deepens that insight. Lucas: It does. And we're actually seeing some companies experiment with making the pain more salient. There's a fintech startup in Europe called YNAB — You Need A Budget — that encourages users to assign every dollar a job before they spend. That creates a kind of mental friction even with digital payments. Luna: And some banks have introduced features that show you your balance in real time right after a transaction, so you feel the hit immediately. A sort of digital cash effect. Lucas: Right. The bank Monzo in the UK does that — it sends you a push notification with your new balance right after you spend. Users report that it makes them more mindful. So technology doesn't have to eliminate friction; it can help re-introduce it in a way that's still convenient. Luna: So the key insight for me is that the payment method is not neutral. It's a design choice that affects how much we spend. Lucas: That's it. And businesses know this. That's why restaurants and retailers have been pushing contactless payments and mobile wallets. It's not just about speed — it's about removing the brake on spending. If you're aware of that, you can make a more deliberate choice. Luna: I think I'll try the cash experiment for my coffee runs. I'm guilty of tapping five times a week without thinking. Lucas: It's a small change, but the research suggests it could save you a surprising amount over a year. And it's a good reminder that a lot of our financial behavior is shaped by context — not just by how much we earn or how disciplined we think we are. Luna: Absolutely. Thanks, Lucas. That was a really practical episode. Lucas: Happy to. And if you want to dig deeper, the Prelec and Loewenstein paper from 2001 is a classic — it's called 'The Red and the Black: Mental Accounting of Savings and Debt.' It's surprisingly readable for an academic paper.