Behavioural spillovers unpacked: estimating the side effects of social norm nudges

The Institute is funded by the Grantham Foundation for the Protection of the Environment and a number of other sources. [...] The first channel is through the effect of the behaviour targeted by the policy (x1) on the non-targeted behaviour (x2). [...] β̂SE is the estimate of the effect of the policy on the non-targeted decision, x2. [...] The magnitude and the sign of the behavioural spillover effect do not depend on the policy. [...] About 98.28% of the main sample has passed an attention check placed at the be- ginning of the survey.16 From these 98.28%, 99.75% passed a focus check we placed after the pre-treatment questionnaire.17 Furthermore, 81.69% of the participants passed a manipulation check between the food choice and the donation task.18 This suggests that respondents were attentive when taking the survey.