1. Thomas Dohmen is Professor of Applied Microeconomics, University of Bonn, Bonn, Germany.
2. Armin Falk is Director of the Behavior and Inequality Research Institute, University of Bonn, Bonn, Germany.
3. David Huffman is Professor of Economics at the University of Pittsburgh, Pittsburgh, Pennsylvania.
4. Uwe Sunde is Professor of Economics at the University of Munich, Munich, Germany.