I wonder how much of the median salaries for those industries are driven up by licensing and accreditation to practice. If you were to implement a license to p

I wonder how much of the median salaries for those industries are driven up by licensing and accreditation to practice. If you were to implement a license to practice software engineer (thereby eliminating many jobs at the bottom performed by people who wouldn't be able to earn a license, how much would the median income for software engineers go up? Conversely, if you eliminated licensing for dental hygienists and let each practice determine the criteria for hiring, how many people would be employed handling dental hygienist roles and responsibilities that you don't need licensing to perform? How much would increased employment by less qualified individuals bring down the median income?