Working Papers,
Lund University, Department of Economics

Abstract: This paper investigates the use of self-funded commitment contracts to support individuals in achieving their goals of increased physical activity. We compare the effect of soft (non-incentivised) commitment contracts with hard (incentivised) contracts using a randomised experiment with 1629 members of a large gym in Stockholm, Sweden. We find a significant positive impact of being offered a hard contract on monthly visits to the gym and the probability of meeting one's contract goal. Hard and soft commitment contracts increase gym visits by 21% and 8%, respectively, relative to the control group. Trait self-control is negatively associated with the likelihood of accepting a contract and accepting to add stakes. The effect of soft and hard commitment contracts does not, however, differ by trait self-control. Importantly, we find that the effects of both hard and soft contracts were greatest among participants who reported exercising the least at baseline. Our experiment explores the use of a completely self-funded and highly scalable intervention. Our experimental design allows us to shed light on the importance of hard penalties in designing commitment contracts.

Keywords: Incentives; Commitment contract; Self-control; Gym attendance

JEL-codes: C93; D03; I12

Language: English

82 pages, April 11, 2023

Full text files

WP23_4  Full text

Download statistics

• Lund University, Department of Economics
• Home page for this series

Questions (including download problems) about the papers in this series should be directed to Prakriti Thami ()
Report other problems with accessing this service to Sune Karlsson ().

This page generated on 2024-03-11 10:21:11.