John R Logan1, Yiping Fang2, Zhanxin Zhang3. 1. Department of Sociology, Brown University, Providence RI 02912, États-Unis, john_logan@brown.edu. 2. Institute for Housing and Urban Development Studies, Erasmus University, P.O. Box 1738, 3000 DE Rotterdam, Pays-Bas, y.fang@ihs.nl. 3. Chinese Academy of Social Sciences, 5, Jianguomennei Dajie, 100732 Beijing, République Populaire de Chine.