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Norwegian Sch Econ, Dept Econ, FAIR, Helleveien 30, N-5045 Bergen, Norway
Max Planck Inst Res Collect Goods, Kurt Schumacher Str 10, D-53113 Bonn, Germany Norwegian Sch Econ, Dept Econ, FAIR, Helleveien 30, N-5045 Bergen, Norway