Schumacher, Ingmar (contributor); Zou, Benteng (contributor) - 2005
errors are ours. The first author acknowledges financial support from the Chair
Lhoist Berghmans in Environmental Economics …@core.ucl.ac.be.
zInstitute of Mathematical Economics, Bielefeld University, Postfach 100131, 33501,
Bielefeld, Germany. E-mail: bzou … Economics 73,
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