Cities amounts to some $7.2 trillion or 40% of the country s economy. frozen. it includes shanghai with a population of 25 million people, home to the world s busiest port. china is the world s biggest commodity buyer and shanghai the gateway for the raw materials that are heading into the country. it s also a financial hub. the city of shandong 101 million residents china s biggest agricultural exporter. it is a global source of fruits and vegetables. or how about hebei, home to 74 million people a massive producer of wheat, maize and millet. its other key industries, iron processing and steel production. it gives you just a flavour of why the zero covid policy that china continues to follow affects all of us. is already. ..affecting all of us. joining me now is china analyst, isabel hilton.