Recently Jan Stoop, associate professor of Applied Economics at Erasmus School of Economics, visited Freakonomics to talk about his research focussing on the prosocial behaviour of the rich versus the poor. During the podcast, he explains which methods he used for his research and what the most important results were.
"We find that roughly 25 percent of the cash came back from poor families, whereas roughly 75 percent of cash came back from the rich families. But, for us, the biggest shock was in observing that the non-cash envelopes were also not returned by the poor families." According to Stoop. During the podcast he gives an explanation for this effect.