Supply and demand.
Not enough people in a special job? That job becomes more valuable, they pay more for that service. Suddenly, people want to work that job to make more money.
Too many people working some kind of job? That job becomes less profitable to work. It is easy to find workers so employers will pay less for that job.
This creates balance. When there is demand, people will fill the supply. It is not always perfect, but ultimately it is enough.
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