The Alliance for Responsible Professional Licensing commissioned Oxford Economics to conduct a quantitative study of the "effects of occupational licensing across the skill spectrum." Similar to some past research, this research found that, in fields requiring advanced education, the requirement of a license narrows the gender wage gap by almost one-third and the race-driven wage gap by about half. A prior study by the ARPL found that 75% of 952 registered voters supported licensing requirements for highly technical professions. The current report "points to the fact that professional licensing of highly skilled workers should be understood and regulated separately from occupational licensing of trades and vocations."