In this picture taken on August 22, 2016 "bang-bang" porters carry boxes of goods on trollies along a street in Chongqing. A study by Chongqing University in 2010 put the number of bang-bang at between 300,000 and 400,000, but locals dispute the claim. Most bang-bang interviewed by AFP said there were no more than 10,000 still working, with sharp declines in recent years as logistics companies have expanded. / AFP PHOTO / NICOLAS ASFOURI / TO GO WITH AFP STORY: CHINA-ECONOMY-LABOUR by Benjamin HASSNICOLAS ASFOURI/AFP/Getty Images