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Why do shells keep recruiting people?

This company is short of employees.

Some people will let their relatives and friends buy a house first when they enter the shell system. If there is no performance in the future, they will leave, and then the company will recruit a group of people.

Recruit another group of people. Those who don't have a basic salary only get a commission. When there is no performance, they can't do it, so they continue to recruit people.