Yang Zhenghua, a genial 34-year-old with a buzz cut, makes the run from Qijiang to Chongqing most days, bringing a truckload of farm produce to a wholesale market in the city.

• 34岁的杨政华（音）行色匆匆，他大多数时候都是从綦江开车去重庆，将满满一车农产品送到市里的一个批发市场。