Latest / The Copywriting Podcast with Fexingo: Sales Letters, Headlines, and Persuasive Writing / How a Single Comma Increased Sales by 26 Percent
Transcript
- Lucas: So I found a direct mail piece from 1964. The headline was — and I'm reading this carefully — 'Now, you can save up to 50% on your homeowners insurance.' Luna: Okay. That's a pretty standard headline for the time. What's the catch? Lucas: The catch is that before they tested it, the headline didn't have that comma. It was 'Now you can save up to 50% on your homeowners insurance.' Same words. Same offer. Same layout. The only difference was that comma after 'Now.' Luna: And the version with the comma won? Lucas: It beat the control by 26 percent. That's a single punctuation mark lifting response by more than a quarter. Luna: I have to admit, my first reaction is skepticism. I mean, it's a comma. How much difference can a tiny pause make? Lucas: That's exactly what I thought. So I dug into why. The key is that without the comma, your brain reads 'Now you can save' as a single chunk — as if 'now' is just a throwaway adverb. It's like the word is invisible. Luna: But with the comma, 'Now' gets its own beat. It becomes a command. Lucas: Exactly. 'Now' becomes a separate instruction. It signals urgency. The comma forces the reader to pause and register that this is timely. And that micro-pause actually changes how the rest of the sentence lands. Luna: So the comma didn't just add a pause — it changed the grammatical weight of the word. Lucas: Right. It turned a filler word into a trigger word. And this wasn't some one-off fluke. The copywriter, a guy named John Francis Tighe, ran this test across multiple lists and got consistent results. Luna: Tighe — he's the one who wrote the 'You Are Cordially Invited' letter for the Wall Street Journal, right? Lucas: The same. He was a legend in direct mail. And he told me in an interview once that he spent more time on the first three words of a headline than on the rest of the letter combined. He believed the opening beat sets the rhythm. Luna: That's a good reminder for anyone writing anything. But I wonder — does this comma effect still hold in digital? Because we're not reading physical letters anymore. Lucas: Great question. I found a modern equivalent. In 2023, a SaaS company called ProfitWell ran a test on their landing page headline. The control was 'Get actionable subscription data.' The variation was 'Get, actionable subscription data.' Luna: Wait — that sounds grammatically wrong. You don't put a comma after 'Get.' Lucas: But it worked. The version with the comma lifted conversions by 11 percent. The same principle: the comma after 'Get' made the verb stand alone. It turned a generic command into a deliberate one. Luna: So the grammar rule doesn't matter. The persuasion rule does. Lucas: Exactly. Tighe said it best: 'Punctuation is not about correctness. It's about cadence.' The comma tells the reader where to breathe. And if you control the breath, you control the pacing. Luna: I can think of a few headlines that would benefit from that. But also — a lot of copywriters over-punctuate. I see commas used as if they're sprinkles. Lucas: That's the trap. The comma only works when it's strategic. If you sprinkle them everywhere, the reader's brain just skips them. They become noise. The power comes from using one unexpectedly. Luna: So the lesson is: pick one word you want to emphasize, and isolate it with a comma. Lucas: That's a perfect rule of thumb. One comma. One beat. One word that gets elevated. And test it. Because not every word benefits. 'Now' worked. 'Get' worked. But 'Save now' — if you put a comma after 'Save' — might not. Luna: Because 'Save' is already a strong verb. It doesn't need the lift. Lucas: Exactly. The comma works best on words that are typically weak or transitional. 'Now,' 'Here,' 'Yes,' 'So.' Words that readers normally gloss over. The comma forces them to stop and pay attention. Luna: I want to test this on our own email subject lines. I bet we could get a lift. Lucas: If you do, let me know the results. But I want to give one more example — this time from a non-profit. A charity called Food for the Poor tested a letter that started with 'You can help feed a child today.' Versus 'You can help feed a child, today.' Luna: And the comma version won? Lucas: Donations went up 19 percent. Same logic. The comma after 'child' made 'today' feel urgent. Without it, 'today' is just when. With it, 'today' becomes a deadline. Luna: That's a big lift for a charity. And it's free. No extra cost to add a comma. Lucas: That's the beautiful thing about copywriting. The smallest changes — a word, a comma, a line break — can have outsized impact. And the best part is, you don't need a big budget. You need a sharp eye and a willingness to test. Luna: Speaking of which — if this episode sparked something you want to try, or if you've gotten value from these deep dives into copy history, the way we keep this show ad-free is listener support. You can buy us a coffee at buy me a coffee dot com slash fexingo. It's a small way to say this content matters to you, and it helps us keep digging up these stories. Lucas: Yeah, we really appreciate that. And it keeps the show independent — no sponsors dictating which cases we cover. So if you've ever implemented a tip from an episode, that's the best signal you can send. Luna: Alright. Back to commas. One more thing I want to ask — what about the opposite? Are there cases where removing a comma improved response? Lucas: Yes. And this is where it gets counterintuitive. In 2018, a financial newsletter tested a headline that said 'How to retire, at 55.' The comma made the reader pause awkwardly — it sounded like 'retire, at 55' as two separate thoughts. Removing the comma — 'How to retire at 55' — lifted click-through by 8 percent. Luna: So the comma hurt because it broke a natural phrase. 'Retire at 55' is a single idea. Lucas: Right. The rule is: if the word after the comma is tightly bonded to the word before, don't separate them. 'Retire at 55' is a unit. 'Save now' is a unit. But 'Now you can save' — 'now' is not bonded to 'you can save.' So the comma helps. Luna: That's a useful decision framework. Ask yourself: is this word part of the core phrase, or is it a setup? If it's a setup, isolate it. Lucas: Exactly. And test it. I can't emphasize that enough. What worked in 1964 might not work today, but the principle of controlling pace through punctuation is timeless. Luna: I'm going to start reading headlines with a comma in mind now. See which ones feel rushed. Lucas: That's a good habit. And if you find a winner, let me know. I'd love to feature it in a future episode.