How Bundling Rewards Can Help Us Overcome Impatience and Exercise More
This study evaluates how to design effective financial incentives for people who struggle with effort-related impatience, demonstrating that "time-bundled" threshold rewards encourage healthy habits more cost-effectively than standard daily payments.
Takeaway: Structuring financial rewards around weekly targets rather than daily payouts helps impatient people stay active while reducing the overall cost of health incentive programs.
Key Points
Smarter Incentive Design: Time-bundled "threshold" rewards (getting paid only if you hit a step goal at least four or five days a week) generated the same exercise activity as paying per daily workout, but at a 15 percent lower cost to the program provider.
Targeting Effort Impatience: Threshold contracts were particularly effective for procrastinators and individuals who heavily discount future physical effort, boosting their target compliance rates by roughly 30 percent relative to patient individuals.
Real Health Improvements: Financial nudges increased daily walking among diabetic participants by 20 percent and noticeably improved blood sugar control, with healthier habits persisting months after the financial rewards ended.
Why is sticking to healthy habits so difficult? We all know that regular exercise helps prevent chronic conditions like diabetes and heart disease. Yet gym memberships go unused, and daily step goals get pushed to tomorrow.
The fundamental challenge is a mismatch in timing: the physical effort required to go for a walk happens today, while the health benefits arrive months or years in the future.
Governments, health insurers, and employers increasingly use cash rewards or gift cards to nudge people toward healthier choices. But designing these programs effectively is tricky. Should you pay someone every single day they exercise?
Or should you pay them only if they hit a weekly goal? Does delivering rewards daily rather than monthly actually change behavior?
Research
Economists Shilpa Aggarwal, Rebecca Dizon-Ross, and Ariel Zucker set out to answer how incentive contracts can be structured to motivate people who are impatient over physical effort.
The researchers conducted a randomized controlled trial involving nearly 3,200 diabetic and pre-diabetic adults in Coimbatore, India. Participants were given pedometers and offered financial rewards (in the form of mobile phone credit recharges) for reaching a daily goal of 10,000 steps over 12 weeks.
To determine the best incentive structure, the team randomly assigned participants to different contract types:
Standard Linear Contracts: Participants earned a fixed reward for every single day they reached 10,000 steps.
Time-Bundled Threshold Contracts: Participants earned rewards for their active days only if they hit the 10,000-step target on at least four or five days during the week.
Varying Payment Frequencies: Participants received their earned rewards daily, weekly, or monthly to test whether payment delay mattered.
Findings
The researchers found that time-bundled threshold contracts achieved the exact same average level of exercise compliance as standard daily linear payments, but cost 15 percent less to administer overall. Because threshold contracts withhold payouts during weeks when participants miss their minimum targets, organizers ended up paying fewer total rewards for the exact same amount of physical activity.
Why do these bundled goals work so well? The key mechanism lies in how humans view future physical effort. For participants with high impatience over physical exertion, threshold contracts increased daily target exercise by 6 percentage points more than standard daily contracts—a 30 percent improvement over average program impacts. When future rewards depend on current effort, impatient individuals are persuaded that working hard today makes reaching the overall weekly goal much more achievable, effectively making future effort feel "cheaper."
By contrast, changing how quickly payments were delivered (daily versus weekly versus monthly) had no detectable impact on exercise rates. This suggests that participants were not particularly impatient about receiving small financial transfers; rather, they were impatient about giving up their time and exerting physical effort.
Beyond contract design, the overall walking program generated impressive health results. Participants offered exercise incentives walked roughly 20 percent more per day—an extra 1,260 steps daily—leading to measurable reductions in blood sugar levels (HbA1c and random blood sugar). Crucially, about half of this increased exercise activity persisted for three months after the financial rewards stopped, showing that the program helped build lasting habits.
Limitations and Considerations
While threshold contracts work exceptionally well on average, setting thresholds too high could backfire for individuals with very low initial fitness if the goal feels completely unattainable. Additionally, the study evaluated rewards delivered as mobile phone credits in an urban Indian setting; while the behavioral insights apply broadly, absolute baseline activity levels may vary across different global populations.
Why This Research Matters
For health insurers, public health officials, and corporate wellness managers, this research provides a practical blueprint for building smarter nudge programs. By replacing flat daily rewards with bundled weekly goals, program managers can stretch public health budgets 15 percent further while delivering the strongest boost in motivation to the very people who struggle most with procrastination and effort impatience.
Learn More
Paper Title: Designing Incentives for Impatient People: An RCT Promoting Exercise to Manage Diabetes
Authors: Shilpa Aggarwal, Rebecca Dizon-Ross, and Ariel Zucker
Journal: American Economic Journal: Applied Economics
Publication Year: 2026
URL: https://www.aeaweb.org/articles?id=10.1257/app.20240564
Econ Today Explains
Economic Concept: Domain-Specific Discounting
Standard economic models often assume that people discount all future events at a single, consistent rate. In reality, our patience depends heavily on what domain we are dealing with—a concept known as domain-specific discounting.
A person might be relatively patient when waiting for a financial payout or a bank transfer, yet extremely impatient when deciding whether to exert physical effort or perform an uncomfortable task right now. Recognizing that people discount physical effort much more severely than money allows economists to design customized contract structures—such as bundled goal thresholds—that directly offset our natural tendency to delay effort.
This article was written by AI but reviewed by a real human.
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