✅ Psychology
Give people a head start and more of them finish
People try harder to finish a goal once they believe they’ve already started it, even when the head start is made up. In Nunes and Drèze’s 2006 car-wash study, a 10-stamp loyalty card that came with two stamps already filled got nearly twice as many completions as a blank 8-stamp card, though both needed exactly eight washes. The work was identical; framing it as progress already made is what got people to finish.