Supply and demand.
Lau
Lu
L
D002140:California; D004465:Economic Competition; D004521:Educational Measurement / Q000191:economics / Q000379:methods*; D004990:Ethics, Dental; D005249:Fees and Charges; D006801:Humans; D008005:Licensure, Dental / Q000191:economics / Q000941:ethics; D010361:Patients