机构:
Univ Penn, Sch Law, Philadelphia, PA 19104 USAUniv Penn, Sch Law, Philadelphia, PA 19104 USA
Chang, Howard F.
Sigman, Hilary
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机构:
Rutgers State Univ, Dept Econ, New Brunswick, NJ 08903 USA
Natl Bur Econ Res, Cambridge, MA 02138 USAUniv Penn, Sch Law, Philadelphia, PA 19104 USA