What do we call the trend whereby members of an occupation insist that people earn certain credentials in order to enter the occupation?

Name: What do we call the trend whereby members of an occupation insist that people earn certain credentials in order to enter the occupation?
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Professionalization refers to the process of establishing a set of standards, including educational credentials, for entering a profession. This often includes formal education, certification, or licensure requirements.

What Do We Call the Trend Whereby Members of an Occupation