Precommitment: decide before the sale decides for you
Precommitment means making a rule while you are calm, and here it is tried on an online festive sale with a written list of three things and a ceiling price for each.
- autopilot
- hermes
- decisions
Priya opens the sale app at 9 pm, only to look. By 11 pm she has a cart of seven things, a timer counting down on a speaker she did not plan to buy, and no clear idea what she came for.
She is not careless. The evening was simply set up so that every choice is made in the moment, with a countdown running.
What precommitment is
Precommitment means you make a decision while you are calm, in a way that binds the version of you who will be tempted later. The economist Thomas Schelling wrote about it. The old story for it is Ulysses, who had himself tied to the mast before his ship passed the sirens, because he knew he would not trust his own judgement once he heard them.
You do not need a mast. A rule written down in a quiet hour does the same job on a smaller scale.
One sale, two evenings
Take Priya, a teacher in Nagpur. Her mixie has stopped working, and she also wants a better pair of earphones. The festive sale opens in two days.
In the first version, she opens the app on sale night and scrolls. Each deal says it is almost gone. She compares a price with a crossed-out price, feels she is saving money, and adds things. The question she is answering is no longer what she needs. It is whether this price is a good deal, and a crossed-out price makes almost any item look like one.
In the second version, she writes a list tonight, two days before. Three lines:
- Mixie, ceiling ₹3,500.
- Earphones, ceiling ₹1,800.
- Her mother's gift, a shawl, ceiling ₹1,200.
On sale night, the question is different. She searches for the first item, checks the price against her ceiling, and buys or moves on. The countdown timer is still there, but it has nothing to ask her. Her rule was made in a calm hour, and it still holds in a hot one because she does not have to decide again.
Where it stops
A rule is only as good as the person who wrote it. If Priya writes a ceiling of ₹3,500 without looking at what a mixie usually costs, the rule binds her to a bad number. So write your ceilings after a quick look at ordinary prices, not on the day.
Also, a rule you can quietly rewrite at 10 pm is not a precommitment. If you notice yourself raising a ceiling mid-sale, that is the signal to close the app and ask what changed, other than the clock.
One thing to try today
Tonight, before you open any shopping app, write on paper or in your notes what you actually need and the most you will pay for each. Keep it to three lines. Open the app only after, and keep the list visible while you scroll.
This is a way to think, not financial, medical or legal advice.
Each Sunday: one mental model and one real decision to try it on. Browse the library at /models.
One model a week.
Each Sunday: one mental model and one real decision to try it on. One click stops it, and the list is never sold or shared.