Examples of barriers restricting individuals from entering a job market include educational, licensing, or quota limits on the number of people who can enter a certain profession such as that of lawyer, and educational, licensing, and experiential requirements for people who wish to be neurosurgeons.
Whilst both types of barriers to entry attempt to guarantee that people entering those fields are suitably qualified, the barriers to entry also reduce competition. This has the effect of facilitating premium pricing for the services of regulated professions. That is, if just anyone could enter these fields, the income of the incumbents would be expected to be lower.
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