The city of Yiwu makes stuff. And around this time of year, one of the main things leaving Yiwu on the backs of trucks are lots and lots and LOTS of little plastic Christmas trees.This year, some of eastern China's biggest ports have been slowed down by covid restrictions and by shipping log-jams at ports all around the world ... and so a lot of the trees, the tinsel, the wreaths and the lights... are all still in Yiwu.