From the main street and all the alleys, all the seats are paved, even the doors are covered, but there is no empty house: every morning, the doors of both streets and alleys float upwards, and the market is so busy that it stops at lunchtime. Gaihangcheng is a gathering place, different from other counties. So there are no empty days when customers and traders come and go, and they are on the road in the afternoon. As for feathers, there are shops to send guests, and other shops know it. The rest of the alleys, bridges and courtyards crisscross, and there are hundreds of thousands of accounts inside and outside the city.