1. Marketing Department, IESE Business School, Barcelona Campus, Avenida Pearson, 21, 08034 Barcelona, Spain.
2. Department of Economics and Business, Universitat Pompeu Fabra and ICREA, Ramon Trias Fargas, 25-27, Barcelona 08005, Spain.
3. Computational and Neural Systems and Division of the Humanities and Social Sciences, 1200 East California Blvd., Pasadena, CA 91125.