Title: Understanding Other-regarding Mechanisms in Heterogeneous Populations

a. Corresponding author b. Haas School of Business, University of California at Berkeley, 545 Student Services #1900, Berkeley, CA 94720, USA. hoteck@berkeley.edu, +1 (510) 643-4272 c. NUS Business School, National University of Singapore, BIZ 1, 8-26, 15 Kent Ridge Drive, Singapore 119245. d. Haas School of Business, University of California at Berkeley, 545 Student Services #1900, Berkeley, CA 94720, USA. e. NUS Business School, National University of Singapore, BIZ 1, 8-26, 15 Kent Ridge Drive, Singapore 119245. f. Department of Economics, Faculty of Arts and Social Sciences, National University of Singapore, AS2 #06-02, 1 Arts Link, Singapore 117570.