explain why the supply of physicians is a major concern. Also answer the followi

explain why the supply of physicians is a major concern. Also answer the following questions:
How would you expect the supply of physicians to affect physician’s incomes and the price and quantity of medical services provided? What is the actual evidence?
You must use a minimum of 3 reputable resources
using this additional link as a source: https://www.cnbc.com/2019/09/06/americas-aging-population-is-leading-to-a-doctor-shortage-crisis.html