Latest / Behavioral Economics with Fexingo: Decision Making, Bias, and How People Really Spend / Why Your Brain Treats Money as a Mental Account
Transcript
- Lucas: So here’s a question — and I want you to answer honestly, because there’s no wrong answer, but there is a very predictable one. You decide to go see a play. The ticket costs twenty dollars. You get to the theater, reach into your pocket, and — you’ve lost the ticket. It’s gone. Do you buy a new one? Luna: I think most people say no. That feels like spending forty dollars on one play. Lucas: Exactly. Now change the scenario slightly. You walk to the theater planning to buy a ticket at the box office. You have a twenty-dollar bill in your pocket. You reach in, and — you’ve lost the twenty dollars. Do you still buy the ticket? Luna: Here I think most people say yes. It’s annoying, but the twenty was just cash, not the ticket. Lucas: Right. And from a pure economic standpoint, both situations leave you equally worse off — you’re out twenty dollars either way. But your brain treats them completely differently. That’s mental accounting. The term was coined by Richard Thaler, the University of Chicago economist who won the Nobel Prize in 2017. Luna: And it’s exactly what it sounds like — we mentally assign money to different buckets. A ticket bucket, a cash bucket, a vacation bucket, a grocery bucket. Lucas: And once money is in a bucket, we treat it as non-fungible. A dollar in the vacation bucket feels different from a dollar in the rent bucket. Thaler showed this in a series of experiments in the 1980s, and it’s one of the most robust findings in behavioral economics. Luna: So why do we do it? It seems irrational, but is there a logic? Lucas: There is a logic, but it’s a psychological logic, not a financial one. Mental accounting reduces cognitive load. If we had to evaluate every spending decision in terms of our total net worth, we’d be paralyzed. So we create rules of thumb. The problem is those rules lead to predictable mistakes. Luna: Like the theater ticket example. In the first case, the lost ticket is already in the ‘entertainment’ bucket. Buying another feels like double-counting. Lucas: Precisely. In the second case, the lost cash hasn’t been assigned yet. It’s still in ‘general funds.’ So buying the ticket just feels like a normal expense. Thaler called this the ‘psychic pain of payment’ — and it’s closely related to the episode we did on the pain of paying. Luna: But mental accounting goes beyond just lost tickets. It affects how we spend windfalls, how we budget, even how we invest. Lucas: Absolutely. Let’s talk about windfalls. Imagine you get a five-hundred-dollar tax refund. Most people treat that as ‘bonus money’ — they’ll spend it on a dinner out, a new gadget, something fun. But if you got the same five hundred dollars as a raise spread across your paychecks, you’d probably save it or use it for bills. Luna: It’s the same amount of money! But one feels like a gift, the other feels like income. Lucas: Exactly. And this is why people sometimes save less when they get a lump sum. They mentally allocate it to a ‘treat yourself’ bucket. Financial advisors actually use this — they advise clients to treat windfalls as ‘future income’ to avoid the temptation. Luna: There’s also the flip side: people are more willing to take risks with windfall money. If you win two hundred dollars at the casino, you might bet it on something silly, but you’d never risk your paycheck that way. Lucas: Right. That’s the ‘house money effect’ — another Thaler concept. Once you mentally separate the money, you change your risk tolerance. And this extends to how we budget. Luna: Give me an example from daily life. Lucas: Sure. Say you budget fifty dollars a week for eating out. You have a great meal on Monday that costs thirty-five. On Wednesday, you’re tempted to grab a fifteen-dollar lunch. But you think, ‘I only have fifteen left in my eating-out budget.’ So you skip it. Economically, you could easily afford the lunch. But the mental budget says no. Luna: And that’s not necessarily bad — it’s a discipline tool. But it can also backfire. Lucas: It can. Because if you blow the budget on Monday, you might say ‘screw it’ and overspend the rest of the week. That’s the ‘what the hell effect.’ You already violated the mental account, so you abandon all restraint. Luna: I’ve done that. I think everyone has. So how do we use mental accounting to our advantage? Lucas: The key is awareness. Once you know you have these mental buckets, you can design them to work for you. For example, some people use separate bank accounts for different goals — one for rent, one for vacation, one for guilt-free spending. That’s just mental accounting made explicit. Luna: And it works because it respects the brain’s natural tendency to compartmentalize. Lucas: Exactly. There’s also a technique called ‘temptation bundling’ — you pair a want with a need. But that’s a topic for another episode. The point is, mental accounting is not going away. It’s how our brains work. The question is whether we let it work for us or against us. Luna: Speaking of working for us, let me ask you this — if you know mental accounting is biased, can you train yourself to ignore it? Lucas: Partially. But it’s hard. Studies show that even when people learn about mental accounting, they still fall prey to it in the moment. The best strategy is to pre-commit. Decide ahead of time how you’ll treat a windfall, or set up automatic transfers so the money never enters your mental ‘fun’ bucket. Luna: So it’s more about engineering your environment than trying to change your brain. Lucas: Exactly. Behavioral economics is really about choice architecture. And that’s something we touch on a lot in this show. If walking through the economy with us has made something click — maybe a way you budget, or how you think about a purchase — it’s because we believe in exploring these ideas without any commercial interruption. Luna: Yeah, we keep the show ad-free by design. It’s a conscious choice so we can focus on the ideas without selling you anything. Lucas: And if that approach resonates, and you want to support it, the simplest way is buy me a coffee dot com slash fexingo. That’s it — no perks, no tiers, just a way to keep this library open. Luna: And it genuinely helps. So back to mental accounting — there’s one more wrinkle I find fascinating. Lucas: What’s that? Luna: The endowment effect. It’s related because once we own something, we mentally place it in a ‘my stuff’ bucket, and we value it more than we would if we didn’t own it. Lucas: Great connection. Thaler’s classic experiment: half the students get a coffee mug, half get nothing. Then they can trade. The mug owners demand roughly twice as much to give up their mug as the non-owners are willing to pay. That’s the endowment effect — and it’s a form of mental accounting where the mug is now in a ‘possessions’ bucket with a high subjective value. Luna: So mental accounting isn’t just about spending — it’s about how we value what we have. Lucas: Right. And it explains why we hold onto stocks that have lost value — they’re in a ‘loser’ bucket, and selling would close that account at a loss. Or why we keep wearing a jacket we don’t like because ‘it was expensive.’ That’s the sunk cost fallacy, which is also a mental accounting error. Luna: So if I want to apply this tomorrow, what’s one concrete step? Lucas: Pick one mental account you want to change. Maybe it’s how you treat your tax refund. Decide right now — before you get the money — that you’ll save seventy percent and spend thirty percent. Write it down. Because once the money hits your account, your brain will default to the old bucket. Luna: That’s good advice. And maybe I’ll finally stop treating my birthday cash as ‘free money.’ Lucas: Good luck. But don’t beat yourself up if you still do — mental accounting is stubborn. The important thing is to catch yourself in the moment and ask: ‘Is this decision about the money, or about the bucket?’ Luna: That’s actually a nice place to leave it. Next time, we’ll dig into another bias that messes with our financial decisions. Lucas: Looking forward to it. For now, keep your mental accounts in check — or at least be aware of them.