Long ago, people in China had four jobs. 

Long ago in China, people had four main jobs. 
Next were the farmers. They grew food in the soil. 
Then came the makers. They used skill to make tools.
Last were the traders. They moved and sold goods.
People could change their jobs. A son could learn a new trade. This helped the whole land grow.
Long ago in China, people were grouped into four main jobs. This was called the four occupations. 
The shi were the first group. At first, they were warrior nobles. They rode in chariots and used bows. 
The nong were the farmers. They worked the soil to grow grain. This work was seen as very important for wealth. 
The gong were the makers. These were artisans who used skill to make tools. 
The shang were the traders. They moved and sold goods.
This system was not like other rules. A person was not stuck in one job for life. A son could learn a new trade. Many people took hard tests to become officials. 
In ancient China, people used a special way to group jobs called the four occupations. 
This system worked by looking at how useful a job was to the land. Scholars were placed first because they used their minds rather than muscle. Farmers came next because they were the primary creators of wealth. Artisans followed them as skilled makers of useful things. Merchants were placed last because people thought they could cause price changes. 

The history of these groups changed a lot over many centuries. Long ago, during the Zhou dynasty, the shi were warrior nobles. 
Many people worked hard to move between these different groups. 

This way of grouping people spread to other parts of Asia too. In Japan, the system was used but the groups were a bit different. In Korea, people called it "Sa, nong, gong, sang." Vietnam used a similar name for the four occupations. 
The four occupations was a system used to classify people based on their work. 
The system worked by ranking groups based on their economic usefulness. The shi were the scholars who used their minds rather than muscle. They were placed first in the hierarchy. Next were the nong, the peasant farmers who grew grain. Farmers were seen as the primary creators of wealth for the land. The gong were the artisans and craftsmen who made useful tools. They used specific skills, known as qiao, to create items. Finally, the shang were the merchants and traders who moved goods. Merchants were often placed last because they could cause price fluctuations. Some thinkers even viewed them as a social disturbance due to wealth accumulation.
These four occupations were not strictly hereditary. This means a person was not forced to stay in their father's job. A son of a gong craftsman could become a shang merchant. In theory, any man could become a government official. They did this by passing the Imperial examinations. This made the system different from European feudalism. However, the system did not include every social group. There were also "mean people" called jianmin who were considered outcasts. These were people in roles like entertainers or prostitutes.
The shi class underwent a massive transformation over many centuries. 
New philosophies helped drive this change in the shi class. The Legalist philosophy in the State of Qin emphasized merit. It rewarded those who labored for the state and obeyed the law. This helped diminish the power of the old nobility. When the Qin dynasty unified China, they replaced feudalism with a centralized government. Later, the Han dynasty introduced recruitment through examinations. Emperor Wu used the Confucian classics to select officials. This created a system where talented individuals could rise through education.
The Song dynasty saw a major expansion of this system. 
The concept of the four occupations spread across the Chinese cultural sphere. 
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