Endowed progress effect
Giving people a head start toward a goal makes them try harder to finish it.
What it means
The endowed progress effect is the finding that people exert more effort to complete a goal when they are given some artificial initial progress toward it, even though that head start is unearned and effectively meaningless. A loyalty card requiring ten purchases for a reward is completed less often than a card requiring twelve purchases that arrives with two already stamped, despite both demanding ten actual purchases—because the second frames the buyer as already underway rather than starting from scratch. The mechanism runs through the goal-gradient effect, in which motivation intensifies as the perceived distance to the goal shrinks; the endowment works by making the task feel begun rather than untouched. Nunes and Drèze traced the pull to this sense of relative progress rather than to any reluctance to waste the free stamps. Reframing the same required effort as advancement toward a partially achieved goal, rather than as a journey from zero, increases persistence and completion. It is widely used in loyalty programs, onboarding flows, and progress bars that begin partly filled.
The goal-gradient engine
The head start borrows its force from the goal-gradient effect, first documented by Clark Hull in the 1930s: laboratory rats ran faster the nearer they drew to food. In people the distance is psychological, fixed by how much of a task looks done rather than how much real work remains. That is why a bar opening at twenty percent beats an identical bar opening at zero — the endowment moves the reference point, not the workload. And it is why two pre-filled stamps do more than remove two purchases: they convert 'not started' into 'underway,' the one boundary that reframes the whole task. Once a goal feels begun, its finish line sits psychologically closer, and each remaining step reads as closing a gap rather than opening one.
The head start needs a reason
The most useful and least known qualifier is that the endowment motivates only if people can explain why they received it. When Nunes and Drèze paired the head start with a rationale — even a thin one, such as a promotion or a loyalty perk — persistence rose. When the same stamps arrived with no justification at all, the effect weakened. A gift that seems random is discounted or treated with suspicion; a gift with a story is accepted as real progress and folded into the goal. The reason can be arbitrary, but it cannot be absent. In practice this is the gap between 'we added two stamps to get you started' and two stamps that simply appear, unexplained, on the card.
What the evidence shows
In the field study, a car-wash card requiring eight stamps from zero was completed by 19 percent of customers; an identical reward needing ten stamps but arriving with two already filled was completed by 34 percent — and those buyers finished sooner. The wider mechanism has held up. Kivetz, Urminsky and Zheng (2006) tracked real coffee-buyers and online raters and saw effort accelerate as people neared a reward, with a matching lift from illusory progress. Koo and Fishbach (2012) mapped when to stress accumulated versus remaining progress, and Kundisch and von Rechenberg (2017) reproduced the pattern with badges in an online community. Across cafés, labs and websites the direction is consistent, which is rarer than it sounds.
Where it breaks down
Two limits deserve respect. First, momentum evaporates at the finish line: Kivetz and colleagues found that once people collect a reward, effort slumps before rebuilding toward the next one — the post-reward dip — so a program that endows progress must re-endow it after each payout. Second, the motivating frame flips mid-goal. Koo and Fishbach's small-area principle holds that early on, highlighting what is already done drives hardest, but past the midpoint, highlighting what remains works better; a bar stuck on 'twenty percent complete' late in a task can deflate rather than propel. With the justification requirement added, the tactic is less a lever to pull than a frame to keep honest, timely and plausible.
Examples
Customers given a coffee card with two of ten stamps pre-filled bought their reward faster and more often than those given a blank eight-stamp card, though both needed eight purchases.
A setup wizard shows your profile as 20 percent complete the moment you sign up, before you have typed a word, and more people push on to finish it.
A fundraising page that opens with a matched donation already on the thermometer draws later gifts faster than an identical page starting from an empty bar.
A role-playing game opens a ten-step quest chain with the first two steps already marked done, framing the chain as begun, and players finish it far more than when the same chain is shown fresh.
A workplace wellness portal credits new hires with 200 of the 1,000 points needed for a premium discount simply for enrolling, and more employees push on to finish the health tasks.
First described in Joseph Nunes & Xavier Drèze (2006).
Key references
- Kundisch, D., & von Rechenberg, T. (2017). Does the framing of progress towards virtual rewards matter? Empirical evidence from an online community. Business & Information Systems Engineering, 59(4), 207–222. doi.org/10.1007/s12599-016-0441-5
- Koo, M., & Fishbach, A. (2012). The small-area hypothesis: Effects of progress monitoring on goal adherence. Journal of Consumer Research, 39(3), 493–509. doi.org/10.1086/663827
- Kivetz, R., Urminsky, O., & Zheng, Y. (2006). The goal-gradient hypothesis resurrected: Purchase acceleration, illusionary goal progress, and customer retention. Journal of Marketing Research, 43(1), 39–58. doi.org/10.1509/jmkr.43.1.39
- Nunes, J. C., & Drèze, X. (2006). The endowed progress effect: How artificial advancement increases effort. Journal of Consumer Research, 32(4), 504–512. doi.org/10.1086/500480