The key challenges facing China in the next two decades derive from the ongoing process of urbanization. China's urbanization rate in 2005 was about 43%. Over the next 10-15 years, it is expected to rise to well over 50%, adding an additional 200 million mainly rural migrants to the current urban population of 560 million. How China copes with such a large migration flow will strongly influence rural-urban inequality, the pace at which urban centers...