A sale can manufacture urgency around a need that did not exist yesterday.

Urgency is a product feature. The countdown, the limited stock, the ending soon, manufacture a need to decide now, and deciding now is precisely what prevents you from noticing that you did not want it yesterday. The pressure is doing the work that the item cannot.

When you feel rushed toward a purchase, leave it for a day. Almost nothing genuinely expires, and what does was usually not needed. The delay costs you occasionally and saves you regularly.