1. Associate Professor and Co-Director of the Energy Institute, Haas School of Business, University of California at Berkeley, Berkeley, California; Research Associates, National Bureau of Economic Research, Cambridge, Massachusetts.
2. Doctoral candidate, Haas School of Business, University of California at Berkeley, Berkeley, California.
3. Li Ka Shing Professor, Haas School of Business, University of California at Berkeley, Berkeley, California; Research Associates, National Bureau of Economic Research, Cambridge, Massachusetts.