- Yale University
- Department of Economics
- University of Southern California
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- Stanford University
- Harvard University
- Departments of Economics
- Graduate School of Business
- National Bureau of Economic Research
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- Harvard University
- Departments of Economics
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- University of Mannheim
- Dept. of Economics
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- National Bureau of Economic Research
- Princeton University
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- The University of Chicago
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- University of California at Berkeley
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- Harvard University
- Departments of Economics
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- Harvard University
- Departments of Economics
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