Latest / Behavioral Economics with Fexingo: Decision Making, Bias, and How People Really Spend / Why Your Brain Trusts a Handshake More Than a Contract
Transcript
- Lucas: You know that moment in a negotiation where someone says, 'Your word is your bond,' and then pulls out a contract? There's actually a fascinating behavioral reason why the handshake matters more than the signature. Luna: I've definitely felt that — when someone insists on a contract, it almost feels like they don't trust you. But logically, that's crazy. A contract protects both sides. Lucas: Exactly. And research from the University of Chicago's Booth School of Business in 2022 put a number on it. They ran an experiment where participants made a promise to split money — either face to face with a handshake, or through a written contract. The handshake group reneged on the deal only about 15 percent of the time. The contract group? Nearly 40 percent. Luna: So the contract actually made people less trustworthy? That seems backwards. Lucas: It is, until you think about how our brains evolved. For most of human history, your reputation in a small tribe was everything. Breaking a handshake meant social exile. A contract, on the other hand, signals that the other person expects you to cheat — so your brain subconsciously gives you permission to do exactly that. Luna: Honestly, if walking through the economy with us has made something click, there's a link at buy me a coffee dot com slash fexingo. That's the only reason this show stays ad-free. No pressure — just if today's handshake conversation was worth a coffee to you. Lucas: Yeah, exactly. And we really mean that — listener support is what keeps us independent. So back to that Booth study: the effect was even stronger when the handshake was between two people who had never met before. Strangers trusted each other more on a handshake than on paper. Luna: I wonder how that plays out in real estate. I've heard that in some markets, a handshake can still close a deal faster than a pile of paperwork. Lucas: It's true. In commercial real estate, especially among smaller players, verbal agreements are common. But here's the catch — the handshake only works if both parties expect to do business again. Reputation is a long-term asset. When you're buying a house from a stranger you'll never see again, the contract matters more. Luna: So the handshake is really a signal of future interaction. It's like saying, 'I'll see you around, so I'd better keep my word.' Lucas: Right. And this is why online platforms are struggling to replicate that trust. Airbnb and Uber don't have handshakes. They have ratings. But ratings are a blunt instrument — they're retrospective. A handshake is prospective. It's a commitment before the fact. Luna: Do you think digital handshakes could work? Like, some startups are experimenting with video promises or even blockchain escrow. Lucas: Blockchain escrow is interesting because it removes trust from the equation entirely. But that's a different psychological mechanism — it's verification, not trust. The handshake works because it triggers our social brain. A smart contract triggers our analytical brain. And the analytical brain is more likely to look for loopholes. Luna: Which brings us back to why the contract group in that study cheated more. They were thinking like lawyers, not like friends. Lucas: Exactly. The researchers called it 'moral licensing' — the contract gave people a license to behave selfishly because they felt the legal document already protected the other person. 'They have a contract, so if I screw them over, they can sue me. No big deal.' Luna: But there's a real-world cost to that. Think about freelance work — a lot of creatives hate contracts because they feel adversarial. They'd rather work on a handshake and a deposit. Lucas: And sometimes that works. But when it doesn't, you have zero recourse. So the behavioral sweet spot might be a hybrid: start with a handshake to establish social trust, then write a contract as a backup. The handshake sets the norm, and the contract just clarifies the details. Luna: That's actually what some savvy entrepreneurs do. They shake hands first, then say, 'Let's put that in writing so neither of us forgets.' It frames the contract as a memory aid, not a threat. Lucas: Language matters a lot. If you say, 'I'd like to get this in writing to protect us both,' versus 'Sign this so you don't screw me over,' you get completely different responses. The first frames the contract as cooperation, the second as conflict. Luna: There's also a gender dimension worth noting. Some studies suggest women are more likely to prefer contracts in negotiations, maybe because they've been burned more often by verbal promises. But I don't have the data on that right now. Lucas: Actually, there is some evidence. A 2019 paper in the Journal of Behavioral Decision Making found that women were slightly more likely to insist on written contracts in one-shot deals, but the handshake effect was equally strong for both genders in repeated interactions. So it's more about context than gender. Luna: What about cross-cultural differences? I've heard that in Japan, a verbal agreement can be more binding than a written one because breaking it brings shame. Lucas: That's a great point. The handshake effect is strongest in cultures with high social cohesion — what sociologists call 'tight' cultures. In 'loose' cultures, where norms are weaker, contracts are more necessary. The U.S. is actually pretty loose compared to Japan or Saudi Arabia. Luna: So maybe the handshake is a signal that you're part of the same tribe. And a contract signals that you're in different tribes. Lucas: That's a really nice way to put it. And it explains why some of the most successful long-term business partnerships I've seen started with a handshake over coffee, not a 50-page agreement. The legal stuff came later, but the trust was established first. Luna: So what's the takeaway for someone negotiating a deal next week? Should they offer a handshake before pulling out the contract? Lucas: Absolutely. Lead with the social bond. Make eye contact, shake hands, talk about your shared goals. Then, when you bring out the contract, frame it as a way to protect that relationship, not a substitute for it. The data says that sequence — handshake then contract — reduces reneging by about 25 percent compared to contract alone. Luna: That's a concrete number to remember. I'm definitely going to try that next time. Lucas: And if the other person insists on a contract first, don't take it as a sign of distrust. They might just be protecting themselves. But you can still build trust after the fact by following through on your handshake promises. Luna: It's interesting how this ties into the broader theme of our show — that our brains aren't built for modern markets. We're still thinking like hunter-gatherers even when signing a lease. Lucas: Exactly. The handshake is a relic of a world where your word was your survival. And even in a world of digital signatures and smart contracts, that relic still works. Maybe it works better. Luna: Alright, so next time you're about to hand over a contract, maybe shake hands first. It might just save you from getting burned — or from burning someone else. Lucas: That's the behavioral economics takeaway for today. Thanks for listening, and we'll see you next time.