The preference survey module : a validated instrument for measuring risk, time, and social preferences / Armin Falk (University of Bonn, DIW, CEPR, CESifo, INET and IZA), Anke Becker (University of Bonn), Thomas Dohmen (University of Bonn, Maastricht University, ROA, DIW and IZA David Huffman University of Pittsburgh and IZA), Uwe Sunde (University of Munich, CEPR, CESifo, DIW and IZA) ; IZA. Bonn : IZA, January 2016