But in traditional cities commercial areas were set apart. In the Tang dynasty capital of Chang'an there were designated business districts, one in the east quarter and one in the west, where virtually all enterprises were concentrated.
唐代長安城就在城東、西各規劃了一個市，就像今天美國與住家分開的商場一樣，幾乎所有商業行為都集合在這兩塊地區，東市稱「都會市」，西市稱「利人市」。