Treatment effect of the two variants of the dictator game.

.The dependent variable is the difference in the contribution to stranger and to in-group member (farmer group member or co-villager). Results derived from a series of three-level random intercept linear regression models in which individuals are nested within farmer associations and interviewers, to control for group and interviewer effects. refers to variability between farmer groups, refers to between interviewers variability, and is the estimated standard deviation of the overall error term.