TY - Front. Econ. China A1 - YAN Weilong T1 - The relationship between urbanization and commodity circulation: a theoretical and positive research Y1 - 2006-06-05 JF - Frontiers of Economics in China JO - Front. Econ. China SP - 220 EP - 233 VL - 1 IS - 2 UR - https://journal.hep.com.cn/fec N1 - 10.1007/s11459-006-0006-5 ER -