Lying asleep on the grass beneath a busy Beijing overpass, Ma Jianliang does not look like the agent of a global trend. His shoes have no laces, his belongings are stuffed into a fertiliser bag by his head and it is past 10am before he stirs from an exhausted sleep.
But the experience of Mr Ma, multiplied by those of a Chinese migrant worker army more than 100m in number, is transforming not only China but also the way in which the world works.
