In a remote place, trade is regular. In due time, buyers and sellers come from all directions to buy and sell at a certain place, commonly known as "going to the market". Xie Zhaoqi of the Ming Dynasty, "Five Miscellaneous Survivors · One of the Regions": "The city in the south of the Five Ridges is called a collection... Shandong people call it a collection. Each collection is a collection of general merchandise, which is contested from four places, ranging from mules, horses, cattle, sheep, slaves, wives, to Dou Su and Chi Bu, which must be gathered on their own day, which is called" going to the market ". Liu Shunian of the Qing Dynasty," Yishui Sanma dialect " "There are many fairs in Yiyi. There are more than 30 famous fairs in Yiyi, and there are countless Yiji and Xiaoji. It's easy to work, so don't go to the fair." The 19th chapter of the Travels of Lao Can: "There are thirty or eight big fairs every month, and dozens of miles of people