The International Agricultural Trade Research Consortium is an informal association of University and Government economists interested in agricultural trade. Its purpose is to foster interaction, improve research capacity and to focus on relevant trade policy issues. It is supported by United States Department of Agriculture (ERS, FAS, and OCE), Agriculture and Agri-Food Canada, and the participating institutions. The IATRC Working Paper series provides members an opportunity to circulate their work at the advanced draft stage through limited distribution within the research and analysis community. The IATRC takes no political positions or responsibility for the accuracy of the data or validity of the conclusions presented by working paper authors. Further, policy recommendations and opinions expressed by the authors do not necessarily reflect those of the IATRC or its funding agencies. For a copy of this paper and a complete list of IATRC Working Papers, books, and other publications, see the IATRC Web Site http : //www.iatrc.org