In this picture taken on August 22, 2016 "bang-bang" porters, also known as "stick-man" due to the bamboo sticks they use for carrying goods, buy watermelon fruit during a short break in 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

In this picture taken on August 25, 2016 a "bang-bang" porter, also known as "stick-man" due to the bamboo sticks they use for carrying goods, takes a nap in 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

In this picture taken on August 22, 2016 boxes of goods are stacked in the open in 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

In this picture taken on August 23, 2016 a "bang-bang" porter, also known as "stick-man" due to the bamboo sticks they use for carrying goods, hold his bamboo stick as he waits for customers in 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

In this picture taken on August 22, 2016 a "bang-bang" porter, also known as "stick-man" due to the bamboo sticks they use for carrying goods, balances boxed goods down a steep alleyway 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

In this picture taken on August 22, 2016 a "bang-bang" porter, also known as "stick-man" due to the bamboo sticks they use for carrying goods, walks in 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

In this picture taken on August 22, 2016 stick-men called "bang-bang" porters receive receipts from their customer (C) after they carried boxes to their destination in 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

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