The Goal-Gradient Effect: Why Customers Come Back Faster Near the Reward (and How to Use It on Your Loyalty Card)

Picture a regular with a stamp card. Do they come back at the same pace from the first stamp to the last?

Not quite. A real café reward program showed that people speed up as the reward gets closer. Here's what the study found, and how to use it in a restaurant, a hotel or a barbershop.

The café study

In 2006, Ran Kivetz, Oleg Urminsky and Yuhuang Zheng published a field study of a real café reward program on the campus of a large East Coast university (Journal of Marketing Research, 2006, doi.org/10.1509/jmkr.43.1.39).

The program was the classic one: one stamp per coffee (one stamp per visit at most), and after ten stamps, a coffee on the house. Each stamp was secretly numbered, so the researchers could reconstruct when every purchase happened. They analyzed 949 completed cards, about 10,000 coffee purchases.

What they found

1. People came back sooner as they got closer to the reward. As members collected more stamps, the time until their next coffee got shorter. On average, the time between purchases fell by about 20% (0.7 days) from the first stamp to the last. At their starting pace, a card would have taken 29.4 days; the real average was 24.6 days, nearly 5 days faster.

2. Without a reward, the speed-up disappeared. A control group carried the same ten-stamp card, but it couldn't be redeemed (they were paid a flat amount for taking part, no matter how much coffee they bought). They didn't speed up. If anything, they slowed down as the card filled.

3. After the reward, people slowed down again. Members who earned their coffee on the house and started a second card bought more slowly at the start of the new card, then sped up again as the second reward got closer.

4. Progress you can see counts, even when it's a head start. In a second field experiment at the same café, customers who got a 12-stamp card with 2 "bonus" stamps already filled finished the 10 required purchases faster than customers with a regular 10-stamp card. Same 10 purchases; the card just looked more complete.

5. The strongest "accelerators" were more likely to come back for more. Members who sped up more toward their first reward were more likely to start another card, and did it sooner.

The authors call it the goal-gradient effect: the closer people feel to a goal, the more effort they put in. The idea goes back to 1930s experiments in which rats ran faster as they got closer to the food. The café study is one of the clearest demonstrations that people do it too, with real money and real coffee.

A related study points the same way. Nunes and Drèze gave car-wash customers loyalty cards that needed 8 washes: one group got a plain 8-stamp card, the other a 10-stamp card with 2 stamps already filled. 34% of the head-start group completed and redeemed the card, versus 19% of the plain-card group (Journal of Consumer Research, 2006, doi.org/10.1086/500480).

What this means for your restaurant, hotel or barbershop

The studies are about coffee and car washes, not your dining room. But the mechanism, motivation rising as a visible goal gets closer, is the same one at work on any stamp card. So it's worth designing for.

1. Make the finish line visible

People can't chase a finish line they can't see. A paper card in a wallet drawer doesn't remind anyone that they're two visits away. A card in their phone's Wallet that shows how many stamps are left keeps the distance in plain sight every time they open it.

2. Keep the big reward worth chasing, and reachable

The effect only works if the goal feels within reach. Pick a reward your regulars actually want, and a number of stamps they can realistically collect at their normal visit rhythm. A barbershop client who comes once a month and a café regular who comes three times a week need very different cards. More on choosing: Stamp card vs. points: which loyalty program fits your business: westify.app/blog/stamp-card-vs-points-loyalty-program.

3. Don't start at zero

Both studies found that a card that already shows some progress gets finished faster. Give the first stamp on sign-up, or count the visit when they join, so nobody starts at an empty card.

4. Add small prizes along the way (optional)

The café study found a slowdown right after a reward, and the biggest push near the end. One way to give guests a nearer goal on a long card is to add small prizes along the way toward the main reward: a cookie at stamp 3, a drink at stamp 6, the big reward at 10. This is our application of the idea, not something the study tested, so keep it simple and keep the main reward the star. Ideas: Restaurant loyalty program reward ideas: westify.app/blog/restaurant-loyalty-program-reward-ideas.

5. Restart well after the reward

The moment someone redeems is the moment their motivation resets. Thank them, and make sure they leave with a new card that already shows progress, so the next finish line is visible from day one.

6. Stamp visits, never reviews

Keep the card about visits or spend, the same for every guest. Don't trade stamps, prizes or discounts for Google reviews. Google's policy allows asking for reviews only "without offering incentives to do so or attempting to influence the rating or the contents of the review" (Maps user-generated content policy, support.google.com/contributionpolicy/answer/7400114).

A quick finish-line checklist

• Can a guest see how many stamps are left without asking? People chase a finish line they can see.
• Is the big reward something regulars actually want? No reward, no speed-up (the control group).
• Can a regular finish the card at their normal pace? A goal that feels far away doesn't pull.
• Does a new card start with some progress? Head starts were finished faster in both studies.
• Is there a reason to keep going right after a reward? Motivation resets after redemption.
• Are stamps only for visits or spend, never for reviews? Google doesn't allow review incentives.

What is the goal-gradient effect?

The tendency to put in more effort the closer you are to a goal. In loyalty programs, it shows up as customers coming back more often as they get near the reward.

Where does the café finding come from?

Kivetz, Urminsky and Zheng, "The Goal-Gradient Hypothesis Resurrected: Purchase Acceleration, Illusionary Goal Progress, and Customer Retention," Journal of Marketing Research, 2006. In a real café program with a coffee on the house after ten stamps, the time between purchases fell by about 20% from the first stamp to the last.

Does it work for restaurants and hotels?

The study was a café, and we don't know of a study that measured it in your exact type of business. But a stamp card works the same way everywhere: a visible goal, getting closer with each visit. Designing your card around that is low-risk and easy to test.

Should I make my card longer so people visit more?

No. A longer card puts the finish line further away, and the pull is strongest near the end. Choose a length your regulars can complete.

Make your finish line visible with Westify

Westify drafts replies to your Google reviews in your voice for you to approve, gives you reports on what your customers say, and includes a loyalty card in Apple Wallet and Google Wallet.

The card shows each guest how many stamps (or points) are left to the reward, and in stamps mode you can add optional prizes along the way toward the main reward. The loyalty card is included on the Growth and Enterprise plans and is an add-on on the Basic plan ($7.99 USD per location per month); plans start at $29 USD per location per month.

Start with our free loyalty card tool, free for up to 20 customers: westify.app/free-loyalty-card

See Westify's loyalty card: westify.app/loyalty-card

Related: westify.app/blog/stamp-card-vs-points-loyalty-program · westify.app/blog/restaurant-loyalty-program-reward-ideas · westify.app/blog/loyalty-card-apple-wallet-google-wallet · westify.app/blog/digital-loyalty-card-guest-vs-owner-view

Sources: 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 · Google, Maps User Generated Content Policy, support.google.com/contributionpolicy/answer/7400114