China’s technology hub Shenzhen on Monday ordered the closure of the world’s largest electronics wholesale market to contain a recent spike in coronavirus cases in the southern city, amidst a call by a leading Chinese think tank for a change in the country’s ‘zero-COVID’ policy that it said was causing widespread disruption of business.China’s technology hub Shenzhen on Monday ordered the closure of the world’s largest electronics wholesale market to contain a recent spike in coronavirus cases in the southern city, amidst a call by a leading Chinese think tank for a change in the country’s ‘zero-COVID’ policy that it said was causing widespread disruption of business.