Being surveyed can change later behavior and related parameter estimates’

Zwane et al. (2011)
Summary by 
Mark Egan

The authors examine whether completing a household survey changed the later behaviour of the participants. This paper describes five field studies, two concerned with microlending and three with health. Subjects in the treatment groups were randomly assigned to receive a survey about household finances and the authors later followed up to check their subsequent use of a related product.In the health studies the authors find that being surveyed increases the use of water treatment products and increases take-up of medical insurance. In the micro-lending studies however, and in contrast to the paper above, they found no effect of surveys on borrowing behavior.