A Question

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Is the principle which prevents a person acquainted in all aspects of a certain role, but without certification of said from any form of institution, from being considered as a potential occupant of said role in the minds of potential recruiters, beneficial or negative from an economic standpoint?

In your opinion is licensure of net benefit or loss to society as a whole? What affect do you believe it has to the individual?

Is there any place for the state enforced licensing of any specific profession?

To clarify, "acquainted in all aspects of a certain role" does not specify strict schooling, as in training received from an institute, but does intend a general competence in a specific field.

I thought of this question after reading some free market economists who are strongly in favour of deregulating (mostly) all industry, and can not think of a benefit to licensure that would or could not be enacted by market forces.