China: 'Pickle index' tracks migrant workers
The ebb and flow of pickle sales reflects the fact that urbanization and economic growth may be slowing, it's suggested. As many as one-in-five Chinese are migrant workers, according to Beijing's Office of National Statistics, often moving from agricultural areas to economic heartlands to make a living. Mass movement of people is such a phenomenon that more than 100 million people travel home during China's so-called "Golden Week" public holidays.
Source: BBC.co.uk