Latest / The Copywriting Podcast with Fexingo: Sales Letters, Headlines, and Persuasive Writing / How One Testimonial Beat a Professional Endorsement
Transcript
- Lucas: There's a direct-mail test from the early 1990s that still gets cited in copywriting workshops — and for good reason. A financial newsletter company tested two versions of a sales letter. Version A featured a glowing endorsement from a well-known economist — think Nobel laureate type. Version B used a simple testimonial from a subscriber in Ohio who wrote, 'I made back three times the subscription cost in my first month.' Luna: I know this test. The testimonial beat the economist by something like forty percent, right? Lucas: Forty-four percent, actually. Response rate on version B was 44 percent higher. And the economist's endorsement wasn't weak — it was specific, credible, full of data. But the subscriber's story resonated more because it felt like someone the reader could actually be. Luna: It's the difference between authority and identity. The economist has authority, but the subscriber has shared identity with the reader. Lucas: Exactly. And that's the principle I want to drill into today: the most persuasive social proof often isn't the most prestigious. It's the most relatable. The subscriber in Ohio wasn't a genius. He was a regular person who got a result the reader wanted. That's magnetic. Luna: So why do so many marketers still lead with the celebrity or the expert? I see it all the time in SaaS landing pages — 'As featured in Forbes' or 'Recommended by Harvard professor.' Lucas: Because authority bias is real, and it works — just not as well as identity-based proof in certain contexts. The key variable is the reader's self-concept. If the reader aspires to be an expert, the economist endorsement might pull harder. But if the reader just wants to solve a practical problem — make money, lose weight, save time — then the story of someone like them is more convincing. Luna: So the copywriter has to know the audience's self-image. Lucas: Exactly. And that's why this 1990 test remains relevant. The newsletter's audience was individual investors, not institutional pros. They didn't see themselves as economists. They saw themselves as regular people trying to grow their savings. The Ohio subscriber was their mirror. Luna: I remember HubSpot used this approach really well a few years ago. Their case studies were always small business owners — not big enterprises — because their core audience was SMBs. Lucas: Right. And Mailchimp famously built their entire brand around the 'small business owner' identity. Their testimonials weren't about how many emails you could send; they were about the bakery that booked twenty extra catering orders after a campaign. Luna: So the lesson isn't 'never use experts,' it's 'match the proof to the reader's identity.' Lucas: Precisely. If you're selling a complex B2B software to IT directors, a testimonial from a peer IT director at a similar company will probably beat a quote from a Gartner analyst. The analyst has authority, but the peer has lived experience in the same role. Luna: What about when the product is aspirational? Like a luxury course or a high-end coaching program? Lucas: Then you might want a mix. Use the celebrity or expert to create aspiration, but back it with a relatable testimonial to build trust. One without the other can feel either out of reach or too ordinary. Luna: That's actually what the financial newsletter did in their next test — they combined the economist's endorsement with a subscriber testimonial. Did it beat the testimonial alone? Lucas: It did not. The combination actually underperformed the testimonial-only version by about 6 percent. The theory is that the economist's presence made the offer feel more institutional, which clashed with the subscriber's casual, relatable tone. Luna: Interesting. So mixing proof types can confuse the reader's identity signal. Lucas: Yeah. It's like saying, 'This is for regular people like you, but also for Nobel laureates.' The reader thinks, 'Wait, which one am I supposed to be?' Luna: That reminds me of a podcast I was listening to — actually, speaking of things that are worth a coffee, if these marketing conversations have sparked something you've actually used, there's a link at buy me a coffee dot com slash fexingo. It's how we keep this ad-free. Lucas: Yeah, it's a small thing that makes a big difference for us. And honestly, if today's episode was worth a coffee to you, that's the link. Luna: Okay, back to the Ohio subscriber. What made his testimonial so effective beyond just being relatable? Lucas: Specificity. He didn't say 'I got great results.' He said 'I made back three times the subscription cost in my first month.' That's a concrete, measurable outcome. And it's modest enough to be believable. If he'd said 'I made a million dollars,' it would have been dismissed. Luna: So the testimonial formula is: relatable identity + specific, modest result. Lucas: Exactly. And the best testimonials also include a tiny bit of context — like 'I was skeptical at first, but...' That adds authenticity. The Ohio subscriber's letter actually started with 'I almost threw this away, but I'm glad I didn't.' Luna: That's gold. It mirrors the reader's own skepticism. Lucas: Right. The testimonial works because it tells a mini-story: I was skeptical, I tried it, I got a specific result. That's more persuasive than any expert quote because it feels like a conversation, not a pitch. Luna: So how do we apply this to modern digital copy? Most people aren't sending direct mail anymore. Lucas: The principles transfer directly. On a landing page, instead of a big logo section of 'As Seen On' media, try a single testimonial from a customer who describes a specific before and after. Put it above the fold. Some companies have lifted conversions by 20 to 30 percent just by swapping a generic quote for a specific one. Luna: And in email? I see a lot of marketers use testimonials in the P.S. section. Lucas: That's a smart spot. But the testimonial needs to be hyper-relevant to the email's offer. Don't use a general 'I love this company' quote. Use one that speaks directly to the pain point the email addresses. Luna: Like if the email is about saving time, use a testimonial that mentions time saved. Lucas: Exactly. And the best B2B testimonials often include a number. 'We reduced onboarding time by 40 percent' beats 'We saved a lot of time.' Luna: What about video testimonials? Do they work better than text? Lucas: They can, because you get tone of voice and body language. But the same principles apply: relatable person, specific result. And video adds another layer of authenticity — it's harder to fake enthusiasm on camera. Luna: So if I'm a copywriter and I want to collect better testimonials, what do I ask? Lucas: Ask for the before and after. 'What was the problem you were facing before using our product? What happened after?' Then ask for a number if possible. 'How much time or money did you save?' And finally, ask for the skepticism moment. 'Were you skeptical at first? What changed your mind?' Luna: That's a great framework. And then edit for clarity, but keep their voice. Lucas: Right. Don't polish it into corporate jargon. The Ohio subscriber probably didn't use perfect grammar, but that's what made it real. Luna: I think the biggest takeaway for me is to stop defaulting to the biggest name I can get. Instead, find the customer who most closely matches my target audience. Lucas: That's it. The most powerful testimonial is the one that makes the reader think, 'That person is me. If it worked for them, it can work for me.' Luna: And that's worth more than a Nobel laureate's signature. Lucas: In many cases, yes. So next time you're writing a landing page or an email, ask yourself: who would my reader trust more — an expert in a tower, or a peer in a cubicle? Luna: Or a peer in Ohio with a three-times return. Lucas: Exactly. That's the episode. Thanks for listening.