There is a discrepancy of the date of this document with a cited Shenzhen newspaper source, perhaps indicating that the question has been on the curriculum for a couple of years. This reference to the Shenzhen "sorting out" is actually of somewhat greater interest than indicated here, as it showed that discrimination against mingong could operate without explicit reference to hukou -- the migrants' housing was condemned on environmental /preservationist grounds.
Lao Dai
Link: http://www.eol.cn/fu_dao_zhi_nan_2720/20061116/t20061116_205409.shtml
Changhe government examination centre for managers and public servants
Sample question for 2007 public service examination -- Hot topic: migrant labor shortage*
Reasons for the dearth of migrant workers:
1) As a result of the advancement of the globalization tide and the tendency to integration of world human resources, China, whose advantage is to a very great extent its cheap work force, undertakes the role, in a sense, of processing factory to the world; the growth of the world's demand of China's labor force, and the speed of production labor force is far slower than that of the speed of change of development of labor utilization brought by the upsurge in investment