I was impressed with Uwe Reinhardt when I met him in person some years ago. And I like what he says in this abstract about occupational licensing. You can get Uwe’s full review at the link above. 

Abstract: The licensing of occupations—a very forceful intervention in markets—is pervasive and growing in modern economies. Yet the attention paid to it by economists and economics textbooks has been small. Highly welcome, therefore, has been the extensive and intensive work on this subject by Morris Kleiner. Kleiner’s latest book, titledStages of Occupational Regulation: Analysis of Case Studies(2013), explores the progression of occupational regulation, from mere registration to certification to outright licensing—three distinct stages. Kleiner carefully selects for his analysis a series of occupations representing the stages of regulation, devoting a chapter to each occupation. He uses a variety of statistical approaches to tease out, from numerous databases, what the impact of mild to heavy regulation on labor markets appears to be. Kleiner’s work leads him to call for a pervasive review of occupational regulation in the United States, with a view towards replacing occupational licensure, which introduces the most inefficiency and welfare loss, with mere certification of occupations. That recommendation gains plausibility in an age where cheap computation and data mining makes it possible to protect consumers from low-quality and possibly dangerous services by providing robust, user-friendly information on the quality of services delivered by competing occupations, such as doctors and nurse practitioners.