The 2022 Economic Report of the President, prepared by President Joe Biden's Council of Economic Advisers, includes a section on occupational licensing and its impact on the labor market. That section (Chapter 4, pages 152-153) references ongoing research by Professor Morris Kleiner and Assistant Professor Janna Johnson.
The report outlines some of the benefits and drawbacks of increased rates of occupational licensing, which varies widely from state to state. Occupational licensing can make it more difficult for workers to enter fields or find appropriate jobs when they move to different states.
Kleiner's and Johnson's research finds that licensing requirements decrease employment and churn within an occupation. But on the positive side, licensing increases wages and wage growth within licensed occupations.