Affiliation: | aDepartment of Economics, Kyung Hee University, Hoegidong 1, DongdaemoonGu, Seoul, 130-701, Korea;bEconomics and Social Development, FAO—Food and Agriculture Organization of the United Nations, Via delle Terme di Caracalla-00100 Rome, Italy;cDepartment of Economics, Texas A&M University, College Station, TX 77843-4228, USA;dDepartment of Economics, Tsinghua University, Beijing 100084, People's Republic of China |