"The Effects of Lottery Prizes on Winners and their Neighbors: Evidence from the Dutch Postcode Lottery," 2011, American Economic Review, 101(5), 2226-2247 (with Peter Kuhn, Peter Kooreman and Arie Kapteyn)
"Payment Choice, Image Motivation and Contributions to Charity: Evidence from a Field Experiment," 2011, American Economic Journal: Economic Policy, 3(1), 180-205.
“Anonymity in Giving in a Natural Context – A Field Experiment in 30 Churches,” 2005,  Journal of Public Economics, 89(11-12), December, 2301-2323