The only reason human labor is still used, he believes, is because it's cheaper in some cases.
"We are using labor in China instead of a machine because labor is cheaper than maintaining machines. If you relocate factories to the States you need to think of how to manage the workers," Zeng explained.
Zeng never saw the strike he was there to monitor, but he believes that sort of strike could easily happen in the U.S. "We don't have labor unions in China. Unions are strong organizations in the States, and that could cause a lot of trouble with management."
He added that high turnover and lack of labor leadership makes strikes unlikely in China.
"The turnover rate is extremely high, people leave after 2 weeks or a month. For ordinary workers, it's very hard to have a thought that, 'hey I don't like this, we need to organize.' It needs to be middle management, a line manager, someone who holds meetings with you every day and who gives demands, and if they said during a meeting 'we need to strike tomorrow and we need to fight for wages,' I could see that. But that's not happening."