士农工商

Explanation: Ancient so-called Si-min, referring to reading, farming, work, and doing business. 　　Source: "Pipe a small Marina": "segment of society who Simin, country rock (pillar) people also." "Let vulgar Huainanzi training": "people do not and is the official, officials did not and things, segment of society, rural states do not vary, the actual occurrence of agricultural and rural power words, words and deeds of persons with disabilities, workers and workers clever words, the number of providers and suppliers words. " 　　Examples: Here Mimicengceng, hundreds of millions of people coming and going, want to fight this thing. Looked thin, ~, everyday, are all there. ★ Qing Li Ruzhen "Flowers in the Mirror" ninety-ninth back