Latest / The Copywriting Podcast with Fexingo: Sales Letters, Headlines, and Persuasive Writing / How the Rule of Three Lifted Response 31 Percent
Transcript
- Lucas: So there's this A/B test from a 2016 financial newsletter that I keep coming back to. The control version listed seven benefits of a research report. Seven bullet points, all solid. The test version cut it down to three. Same offer, same guarantee, same call to action. Luna: And I'm guessing the three won? How much? Lucas: Thirty-one percent lift in response. Not incremental—nearly a third more people took action when they saw three benefits instead of seven. And we see this pattern again and again in direct response. It's the rule of three in action. Luna: Okay, so why does three work so much better than seven? Is it just about shorter lists being easier to process? Lucas: Partly, but it's more specific than that. There's a well-known concept in cognitive psychology called chunking—our working memory can hold roughly four chunks of information, but three is the sweet spot for easy recall. Three feels complete. One is too little, two feels like a comparison, five or more becomes a blur. Three is a pattern we recognize as a set. Luna: So it's not just about cutting clutter, it's about leveraging the way our brains naturally group things? That would explain why so many classic taglines are three words—'Just Do It,' 'I'm Lovin' It,' 'Think Different.' They're all trios. Lucas: Exactly. And not just taglines. Look at Apple's original iPad marketing—'Thin, Light, Powerful.' Three words. They could have said 'thin, light, powerful, with a nine-hour battery, retina display, and an amazing app store.' But they didn't. They knew that three attributes would stick. The rule of three gives you memorability and persuasion in one package. Luna: But is there a risk of oversimplifying? I mean, sometimes you genuinely have more than three compelling benefits. What if you leave out the one that hooks a particular segment? Lucas: That's a fair point, and the key is that the three you choose have to be the most powerful. In that newsletter test, the copywriter didn't just pick three random benefits. They led with the biggest financial gain, then added a time-saver benefit, then closed with an emotional payoff—peace of mind. So the structure itself matters: the first benefit hooks the rational brain, the second adds practical value, and the third hits an emotional button. Luna: So it's like a mini narrative arc. Benefit one: what you get. Benefit two: how it works. Benefit three: how it makes you feel. That's actually a formula you could apply anywhere. Lucas: Right. And it's been used by master copywriters for decades. John Caples wrote a famous ad for a piano course that had three headers: 'How to Play the Piano in One Evening,' 'No Notes to Read,' 'A Trick That Fools Your Friends.' Three distinct promises, each building on the last. That ad ran for years and pulled consistently. Luna: But there's also the danger of making three sound like a lazy checklist. You need a rhythm. The copy should flow from one to the next, not just be three separate bullets. How do you achieve that without adding too many words? Lucas: Great question. Often it's about parallel structure—using the same grammatical pattern so the reader feels the momentum. For example, 'Save time. Save money. Sleep better.' Each one is a complete thought, but together they feel like a progression. Alternatively, you can use a 'three-act' structure in a sentence: 'Our software cuts costs by 40 percent, eliminates manual data entry, and gives you weekends back.' That last one is the emotional payoff. Luna: Weekends back—that's a great closer. So you're saying the rule of three isn't just about the number, it's about the journey you take the reader on. And that journey should be: logical, tangible, then emotional. Three stops. Lucas: Exactly. And if you can test it, you'll often find that three beats four, five, six, or seven. The famous direct marketer Gary Halbert was a big believer in this. He'd write a sales letter and then cut it ruthlessly until he had three core reasons to buy. He said that if you can't explain why someone should buy in three points, you haven't thought hard enough about your offer. Luna: I like that. It forces you to prioritize. Instead of listing everything, you identify the three most compelling arguments. That's actually harder than listing seven, but it's more effective. Lucas: And it's testable. In the newsletter test, the control had seven bullet points listing things like 'exclusive access to our research team' and 'weekly market updates'—all good points but they diluted the impact. The test version narrowed it to 'three actionable stock picks each week,' 'personalized email support,' and 'a money-back guarantee that works.' Notice how the third one is a risk remover—that's the emotional close. Luna: So the lesson for today: next time you're writing a bullet list—whether it's for a landing page, email, or ad—try cutting it to three. And if you're worried about leaving something out, use the 'three plus a link' approach: list the three biggest benefits right there, then add a line like 'and seven more reasons inside.' That way you keep the simplicity while acknowledging there's more. Lucas: That's a smart workaround. Give them the key three, then a curiosity gap to dig deeper. So you get the best of both worlds—the psychological advantage of the rule of three plus the depth of a longer list. And that's exactly what we try to do on this show: give you one concrete, testable tactic per episode. Luna: If today's tactic has sparked something you've actually used—or plan to use—that's exactly what this show is for. And the way we keep these conversations ad-free and focused is through listener support. Lucas: Yeah, if you found the rule-of-three insight useful, you can head over to buy me a coffee dot com slash fexingo. That's buy me a coffee dot com slash fexingo. Even a small gesture helps us keep the podcast independent and free from ad clutter. Luna: And it really does make a difference. So back to the rule of three: one more example I love is from the charity sector. A study on donation appeals found that three specific stories about individuals outperformed one long story or a list of statistics. Three stories created a perfect balance of emotional engagement and cognitive ease. Lucas: That's a great example because it shows the principle crosses industries. Whether you're selling a product, promoting a service, or asking for a donation, three is the number that sticks. So my challenge to you after this episode: look at your current copy. Find a place where you have four, five, or seven bullet points. Try rewriting it as three. Then test it. And send us your results at the Fexingo website; we'd love to feature your win in a future episode. Luna: That's a fitting close. The rule of three: test it, see what happens, and who knows—you might get a 31 percent lift too. Thanks for listening, and we'll talk copy again next time.