Latest / The Copywriting Podcast with Fexingo: Sales Letters, Headlines, and Persuasive Writing / How a Long Sales Letter Beat a Short One by 80 Percent
Transcript
- Lucas: Here's a question that splits every room of copywriters you'll ever walk into: Does a long sales letter actually outperform a short one? Or are we all just clinging to a direct-mail-era myth? Luna: I've seen both sides argue it like it's a blood sport. And I have to admit, I've always leaned short — people are busy, attention spans are shrinking, all that. Lucas: Right, and that intuition is so widespread it's practically gospel now. Every brief from a startup founder says 'keep it tight, nobody reads.' But the data — specifically, a fascinating controlled test from the early 1990s — tells a more complicated story. Lucas: The test involved a financial newsletter called The Oxford Club. Not the social club in London — this was a U.S.-based investment letter that sold subscriptions by mail. They had a control package that was a one-page sales letter. It worked fine. But they wondered what would happen if they went long. Luna: How long are we talking? Lucas: Two pages. Not a booklet, not a magalog — just two sides of a single sheet of paper, printed front and back. The headline remained the same. The offer was identical. The only variable was the amount of copy. Lucas: The two-page version pulled an 80 percent higher response rate than the one-page version. That is not a small blip. That is a near-doubling of revenue from a change that cost nothing extra in production. Luna: Eighty percent — wow. But how? If nobody reads long copy, how did adding more words sell more? Lucas: That's the paradox. The answer is: almost nobody reads the entire long copy either. What happens is that different people scan different sections. The headline hooks the skimmer. The Johnson Box — that bold or boxed text above the salutation — grabs another segment. The postscript at the bottom reels in the people who flip to the end. Lucas: So a longer letter essentially has more 'entry points' for the eye. It creates multiple chances to persuade, because different readers arrive at different parts of the page at different moments. Luna: That makes sense. It's like offering multiple doors into the same room. But doesn't that contradict the whole 'people only read the first paragraph' truism? Lucas: It does, but only if you confuse 'reading' with 'scanning.' A skimmer doesn't read linearly. They bounce around — headline, bold subhead, bullet points, postscript. A long letter that's structured for scanning gives them plenty of landing zones. A short letter often lacks those zones because the writer assumes brevity alone will hold attention. Lucas: John Caples, the legendary direct-response copywriter, once said: 'When you have a lot to say, say it. Don't be afraid of length. Be afraid of being boring.' And Claude Hopkins before him tested length obsessively and found the same pattern — long copy outsells short when every paragraph earns its place. Luna: So the real sin isn't length — it's fluff. But how do you know if your copy is earning its length? Lucas: There's a brutal test: cut any paragraph that doesn't make a specific promise, build desire, or remove an objection. If it only sounds good, delete it. The Oxford Club letter wasn't long because the writer was chatty — it was long because the offer required explaining a somewhat complex trading strategy, and readers needed to feel confident before handing over money. Luna: That rings true. And it's interesting — you don't see a lot of long-form landing pages anymore for simple consumer products. But for high-consideration purchases — courses, memberships, financial services — the long page still dominates. Lucas: Exactly. And that's the modern version of the same test. Software companies like Crazy Egg and Unbounce have published case studies where lengthening their landing page copy increased conversions by 30 to 60 percent. The key is that the extra copy answers questions the visitor naturally has at that stage. Lucas: There's also a behavioral principle at work: effort justification. If someone invests time reading a long page, they're more likely to follow through because they've already mentally committed. A short page doesn't demand that investment, so the decision feels lighter and easier to abandon. Luna: So long copy builds commitment. That's a powerful lens. But I imagine the headline and the lead still do most of the heavy lifting — if the first few lines don't land, the rest is invisible. Lucas: Absolutely. The Oxford Club test proved that, too. When they tested different headlines on the long letter, response varied by over 100 percent. The body copy mattered, but the headline was the gatekeeper. If the headline doesn't stop the scan, the two-page letter becomes a two-page blank. Luna: And by the way, if you're the kind of person who actually enjoys thinking about these mechanics — testing headlines, dissecting response rates, geeking out over which paragraph earned its keep — then you might get why listener support matters to a show like this. Lucas: You beat me to it. Yeah, these conversations exist because we don't run ads. No sponsors pushing a version of the truth. The whole thing runs on listeners who find value and want to keep it that way. If that's you, there's a simple way to chip in — a coffee's worth, whatever feels right. Luna: It really does make a difference. So if you've ever learned something from the show — a headline trick, a testing insight, even just a good story — you can head to buy me a coffee dot com slash fexingo. No pressure, just an open door. Lucas: And that's it. Now, back to the length question — because there's another layer I find fascinating. The Oxford Club test also revealed something about what happens inside the letter, specifically the role of the postscript. Luna: Oh, the P.S. is famous in direct mail. Some tests show it's the second-most-read element after the headline. Lucas: Exactly. In the two-page Oxford letter, the postscript restated the core offer and added a time constraint. Many recipients admitted later they flipped to the P.S. first, then decided whether to read the rest. The one-page version had a P.S. too, but it was shorter and less compelling because the writer had compressed everything. Lucas: So the length allowed the P.S. to breathe. The writer could be specific — a dollar amount, a deadline, a guarantee. That specificity drove action. In the short version, the P.S. felt rushed, almost like an afterthought. Luna: That's a great tactical takeaway: if you're going short, don't skimp on the P.S. Give it room even if the rest is tight. But honestly, most marketers today don't use a P.S. at all. They write a landing page and call it done. Lucas: And that's a missed opportunity. On a landing page, the equivalent of a postscript is the closing section before the button — the final reassurance, the guarantee, the 'what happens next.' Many tests show that strengthening that last block lifts conversions more than rewriting the headline. Lucas: The golden thread through all this is: match length to the complexity of the decision. A low-price impulse buy needs short copy. A high-stakes subscription or service needs longer copy that builds trust. The mistake is applying the impulse-buy rule to everything. Luna: So next time a client says 'make it shorter,' I'll ask: what does the reader need to know to feel safe saying yes? And if the answer takes more words, so be it. Lucas: Exactly. And test it. The Oxford Club didn't assume long was better — they tested. That's the real lesson. Length is a variable, not a doctrine. Luna: I'd love to see a modern replication of that test — maybe a SaaS landing page with two versions, one long one short, same offer. My guess is the long version still wins for any product over $50. Lucas: I'd bet on it too. And if you run that test, let us know. We might turn it into an episode. Luna: Alright, that's a wrap for today. Until next time, keep testing.