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Sales psychology for marketing, 13 of 14The pratfall effect
Also called Honest flawsOnce you've shown you're good, an honest flaw makes the rest easier to believe.
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Someone who is clearly competent becomes more likeable after showing a small, honest flaw. In marketing, admitting a real trade-off in an ad, a founder video or a sales call can make your other claims easier to trust.

Why it works
In a 1966 study by Elliot Aronson and colleagues, listeners rated a highly capable quiz contestant as more likeable after he clumsily spilled coffee. The same blunder made an average contestant less likeable, so a small flaw only helps once competence is already clear.
Research: Aronson and colleagues 1966
Where to use it
Show the job that went sideways and how you fixed it, or the thing you got wrong early on. Pair the flaw with proof you're good at the work.
Lead with a real trade-off your best customers won't mind: a wait list, a higher price, a narrow focus. It filters out poor fits and makes the rest of the ad easier to believe.
Add a short 'who this isn't for' section. Turning some buyers away tells the right ones you know exactly who you help.
Name the downside of your offer before they find it. It shows you aren't hiding anything, and it makes your recommendation sound honest.
Reply to a critical review calmly, own the part that was your fault, and say what changed. Handled well, it makes the good reviews around it easier to believe.
Steal these
Fill in the brackets and use them in your next post, ad or email.
- We aren't [the cheapest or fastest]. Here's why [customers] still choose us.
- This isn't for you if [honest disqualifier].
- The honest downside of [offer]: [real trade-off]. Here's why it's worth it.
- I got [thing] wrong for [time]. Here's what I do now.
- You're right, we [mistake]. Here's what we changed.
Before and after
The best, most reliable service in town, guaranteed!
We aren't the cheapest, and there's usually a short wait. That's the cost of doing every job properly.
Nobody believes the first line, because everyone says it. The second admits a real trade-off, which makes the promise after it easier to believe. It only works if your reviews and your work back it up.
Where it backfires
Admitting a flaw in the core job. 'We're sometimes booked out' builds trust. 'Our work sometimes needs redoing' just loses the sale. And it only helps once people can already see you're good.
Pairs well with
The bandwagon effectPut the honest flaw next to real reviews, so people can see you're good before they hear the trade-off.Common questions
Will admitting a weakness lose me customers?
What kind of flaw is safe to share?
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