Latest / Behavioral Economics with Fexingo: Decision Making, Bias, and How People Really Spend / Why Your Brain Trusts a Familiar Voice Over the Data
Transcript
- Lucas: You ever notice how the same song can sound just okay the first time you hear it, but by the tenth time you actually like it? Not because the song changed — your brain changed. Luna: It's like that one track your friend puts on repeat. At first you're neutral, then you're humming it in the shower. Lucas: Exactly. And that's not just a quirk of pop music. It's a well-documented psychological principle called the mere-exposure effect. Basically, the more you're exposed to something — a person, a brand, a shape — the more you tend to like it. Luna: Even if you never consciously think about it. Right, there's that classic study from the 1960s by Robert Zajonc. Lucas: Zajonc, yes — University of Michigan. He showed participants a series of nonsense words like 'kadiraga' and 'afworbu' — no meaning at all. But the words that appeared more often, even just a few extra times, were rated as more pleasant. Luna: And he did it with Chinese characters too, for participants who couldn't read Chinese. Same result. More exposure, higher favorability. Lucas: That's the key — the effect works even when the exposure is subliminal. In one follow-up, Zajonc flashed images so quickly that people couldn't consciously report seeing them. But the ones they'd seen more often, they still liked more. Luna: Your brain is basically keeping a subconscious tally. And it interprets 'I've seen this before' as 'this is safe, this is good.' Lucas: Right, which from an evolutionary standpoint makes sense. Familiar things are less likely to be predators or poisonous plants. But in a modern economy, that same shortcut gets exploited constantly. Luna: Advertising, obviously. That's why Coca-Cola spends billions a year — not to tell you something new, but just to keep the logo in front of you. Lucas: And it works. There was a meta-analysis in the Journal of Advertising Research that found a strong correlation between ad frequency and brand preference, even when the ads contained almost no information. The exposure itself was the message. Luna: But there are subtler examples. Think about hiring. If two equally qualified candidates interview, the one who went to the same college as the hiring manager often gets the edge. Not because the college is better — just familiarity. Lucas: Or investing. People tend to overweight stocks of companies they use every day — Apple, Amazon, Netflix — even if the numbers don't justify it. Familiarity feels like safety, but it's not the same as a good price to earnings ratio. Luna: And on the flip side, the mere-exposure effect can work against new, better products. If you've never heard of a challenger brand, you're less likely to trust it — even if it's objectively superior. Lucas: A really clean example came from the music industry. Researchers looked at Spotify playlist data and found that songs from major labels — which get heavy rotation on radio and playlists — are disproportionately liked, not because they're better, but because listeners are more familiar with them. Luna: So independent artists face a double hurdle: not only do they have less distribution, but even when people do hear their music, they need multiple exposures before the brain starts to warm up. Lucas: And that's where the effect gets interesting — because it's not just about liking. It also affects trust. Zajonc did another experiment where participants rated the truthfulness of statements like 'Mercury has a high boiling point.' The statements they'd heard before, even if they'd forgotten hearing them, were rated as more true. Luna: That's the 'truthiness' effect. And it's scary when you think about misinformation. If a false headline is repeated enough, it starts to feel true — just because of familiarity. Lucas: There's a famous study from 2015 where participants read fake news headlines. The ones they'd seen once before — even if they initially thought they were false — were more likely to be rated as accurate on a second exposure. That's pure mere exposure. Luna: So what's the takeaway? How do we guard against this bias without becoming paranoid? Lucas: I think the first step is awareness — just knowing that your brain equates familiarity with truth and goodness. Then, in high-stakes decisions — hiring, investing, buying a car — deliberately seek out the unfamiliar option and evaluate it on its actual merits. Luna: But isn't there also a case where mere exposure is actually useful? Like, you shouldn't overthink your choice of toothpaste. Lucas: Totally. For low-stakes, frequent choices, relying on familiarity is efficient. It frees up mental energy for things that matter. The problem is when the bias spills over into big decisions where we should be more deliberate. Luna: So the goal isn't to eliminate the effect — it's to recognize when it's running the show. Lucas: Exactly. And I'd add one more thing: if you're trying to build a brand or a career, mere exposure is your friend. Consistency and repetition — not flashy stunts — are what build lasting preference. Luna: That's actually a reassuring thought for a podcast. We just keep showing up, and eventually people like us more. Lucas: Speaking of which, if this episode — or any episode — has been useful to you, there's a simple way to keep us showing up. The way we stay ad-free is listener support. If you've gotten something out of walking through the economy with us, you can head to buy me a coffee dot com slash fexingo. Luna: Yeah, it's a low-pressure way to say 'this matters to me.' And it genuinely helps us keep the lights on and the research volumes open. Lucas: Alright, back to the research. There's another angle on mere exposure that I find fascinating — the 'familiarity breeds liking' curve actually has a limit. If you over-expose someone to the same stimulus, it can flip into irritation. Luna: Oh, the annoyance threshold. Like when a song is overplayed on the radio. Lucas: Exactly. In the 1980s, psychologist Robert Bornstein did a meta-analysis and found that the mere-exposure effect is strongest with very brief exposures — like a few seconds. Once you're exposed dozens of times, the effect plateaus and can even reverse. Luna: That's why your favorite song from last summer is now a skip. Your brain got its fill. Lucas: And for marketers, that's a crucial insight: there's a sweet spot. Too little exposure and you're not memorable. Too much and you're annoying. The goal is to be present but not pervasive. Luna: So the next time I see the same ad for the tenth time, I'll know: my brain is being gently nudged — and I can decide whether to question it or just enjoy the familiarity. Lucas: That's the power of knowing the bias. You get to choose. And that's what this show is about — understanding the hidden forces so you can make better decisions, not just default ones.