The 10-second rule.
one pause, one sentence, most bad purchases gone · a 3-minute read
Here is the entire rule: before you press Buy, stop for ten seconds and say why you're buying it — in one honest sentence. That's it. It sounds too small to matter. It kills more impulse purchases than any budget ever written.
Why ten seconds beats willpower
Impulse buying happens in a specific mental state: fast, hot, pattern-matched — see, want, click. Everything about checkout design exists to keep you in it. The ten-second pause doesn't fight the impulse; it just outlasts it. Impulses are sprinters. Even a tiny delay forces the slow brain — the one that knows your bank balance — back into the room.
Why the sentence matters more than the seconds
Silence for ten seconds is easy to wait out. A sentence is not, because excuses have to survive being articulated. "It replaces the broken one" survives. "It's 40% off" collapses — that's the shop's reason, not yours. "I've had a long week" collapses. "I saw it on TikTok an hour ago" collapses with witnesses. If the honest sentence sounds stupid, the purchase was.
Making it stick
- Say it out loud or type it. Internal monologue cheats. Externalised words can't.
- Attach it to the goal. The full sentence is "I'm buying this because ___, and I choose it over ___" — where the second blank is the thing you're saving for. That's the version with teeth.
- Automate it. You will not remember the rule at 11pm on a Tuesday. That's the entire reason we built a Chrome extension that enforces it: countdown, mandatory excuse box, your goal on screen, at every checkout.
The 10-second rule, installed: really? is a free Chrome extension that interrupts any checkout with a countdown, makes you type why you’re buying, and keeps score of every purchase you walked away from — measured against the thing you actually want. See it judge a checkout live or install it free.
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