There seems to be a record in Liang Lumeng that people in the Song Dynasty didn't make a fire to cook or something. It's like everyone in the Song Dynasty had money and leaked oil. In fact, it is not surprising that rich people often eat out, and it is normal for poor people to eat out. "Jisheng in Beijing" records some small shops specializing in home cooking, such as shrimp and fish, noodle soup and fish noodles. This kind of small shop "can go to those who want to be rough and full, but not to noble people." "Tokyo Dream": "Fried fish, fried duck, fried rabbit, fried pork, plum juice, blood soup, noodle soup and so on. Only fifteen dollars each. " In the Northern Song Dynasty, the annual rice price was about 800, and 15 was 2%. Compared with the current price, a fast food of 5 yuan is really hard to find.