Can Simple Psychological Interventions Increase Preventive Health Investment?


Behavioural constraints may explain part of the low demand for preventive health products. We test the effects of two light-touch psychological interventions on water chlorination and related health and economic outcomes using a randomised controlled trial among 3,750 women in rural Kenya. One intervention encourages participants to visualise alternative realisations of the future; one builds participants' ability to make concrete plans to achieve goals. Both interventions include information on health benefits of chlorination. After twelve weeks, both interventions increase the share of households who chlorinate drinking water and reduce child diarrhea episodes. Analysis of mechanisms suggests both interventions increase self-efficacy – beliefs about one's ability to achieve desired outcomes – as well as the salience of chlorination. They do not differentially affect beliefs and knowledge about chlorination (compared to a group who receive only information), nor affect lab measures of time preferences or planning ability. Results suggest simple psychological interventions can increase the use of preventive health technologies.

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Saving and Insurance
Decision-Making and Behavioural Biases
CSAE Working Paper WPS/2019­09