In addition to the above, this is worth reading:

Over half of China's people now live in urban areas

Over the next ten years the government remained wary of free movement, even as it made its peace with free enterprise. Touting a policy of “leaving the land but not the villages, entering the factories but not cities”, it sought industrialisation without urbanisation, only to discover it could not have one without the other.





http://www.economist.com/blogs/graph.../daily-chart-6
This influx will have to manage within the infrastructure available and that will not be adequate since the cities were not geared for such an influx.

The result is for everyone to see.