1978年以后,中国开始实行经济体制改革,家庭责任制替代了集体生产队制度,农村居民获得了一定的个人自由,劳动生产率相应地提高了(Lin,1992),生产率的提高使得城镇自由市场的食品大大充足,食品配给制度也最终被取消(Zhao,1999b)。同时,劳动生产率的提高也产生了大量农村过剩劳动力,由于以上几点,城乡迁移变成了可能的行为。此外,城镇地区经济特区的设立和发展,非国有部门的扩张,城镇就业政策的放松,这些都产生了对移民的需求(Meng and Zhang,2001;Cai,2001)。同时,国家发展战略从资本密集型产业转向劳动密集型产业在城镇地区创造了更多的就业岗位,这在客观上产生了放松户籍制度的要求(赵忠,2004)。
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