Yi Liu The University of Reading   Room 401, Gate 3, Building 38 Xiang Hongqi, PO Box 998, Haidian District Beijing, Beijing 100091 China   yiliu@hotmail.co.uk         Primary Research Focus: Food economics, nutrition   JEL Areas: Q0 : Agricultural and Natural Resource Economics; Environmental and Ecological Economics: General I0 : Health, Education, and Welfare: General