China's population of 1.3 billion makes it a staggering one fifth of the world's population. This huge population resource means not only is China the world's largest market, but it also underpins the main reason for its economic rise---a large workplace. The incredible economic growth inChina has meant huge changes for the workforce. For example, it is estimated that about 200million people have moved from rural areas to urban areas find work, resulting in the biggest mass migration in history.