C hristmas comes early to Yiwu, a bustling entrepôt just a couple hours by train from China’s coastal megacity of Shanghai. This city of two million reputedly produces nearly two-thirds of all the Christmas decorations purchased worldwide. On Sunday, traders of every nationality were already scouring its labyrinthine International Trade City, colloquially known as simply Yiwu Market, for samples of festive baubles and tinsel. Typically, orders arrive from April, nearby factories then get to