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Mechanism design offers a strategy to overcome this issue: offer an \u201cincentive\u2010compatible\u201d menu of policy choices designed to induce participants to select the variant intended for their type. Using a field experiment that personalized incentives for exercise among 6,800 adults with diabetes and hypertension in urban India, we show that personalizing with an incentive\u2010compatible choice menu substantially improves program performance, increasing the treatment effect of incentives on exercise by 80% without increasing incentive costs relative to a one\u2010size\u2010fits\u2010all benchmark. Offering choice achieves similar performance to personalizing with an extensive set of observable variables, but without the same data requirements.<\/jats:p>","DOI":"10.3982\/ecta21926","type":"journal-article","created":{"date-parts":[[2026,7,16]],"date-time":"2026-07-16T13:05:52Z","timestamp":1784207152000},"page":"1409-1448","source":"Crossref","is-referenced-by-count":1,"title":["Mechanism Design for Personalized Policy: A Field Experiment Incentivizing Exercise"],"prefix":"10.3982","volume":"94","author":[{"given":"Rebecca","family":"Dizon-Ross","sequence":"first","affiliation":[{"name":"Booth School of Business, University of Chicago"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ariel","family":"Zucker","sequence":"additional","affiliation":[{"name":"Department of Economics, University of California"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"2359","published-online":{"date-parts":[[2026]]},"reference":[{"key":"ecta70052-bib-0001","unstructured":"Abubakari, Sulemana, Kwaku P. 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