What are the four grades of civilians in China society after Qin and Han Dynasties?

After Qin Dynasty, the common people in China society were divided into four grades: scholar, farmer, worker and businessman. The ancients arranged them according to their contribution to society.

Why the scholar ranks first: "everything is inferior, only reading is high", Lide is in the heart, making contributions to the world, and proclaiming virtue in words, which is favored by future generations.

Why do farmers rank second: "The granary is courteous", "Food is the most important thing for the people", and "There is surplus food at home, so don't panic", especially in countries with agriculture as the mainstay.

Why do workers rank third: "If you want to do a good job, sharpen your tools first". With the help of tools, efficiency can be improved.

Why business ranks fourth: business needs each other, and it must rely on others to operate. Only a few people can attend. If everyone goes into business and depends on others, then no one can rely on anyone. Commercial status ranks last, and there is a deep meaning of not prohibiting and not advocating.