Shortage of Doctors projected...Demand and Supply---It is taught in Introductory Econ classes...

Medical Schools Can't Keep Up
As Ranks of Insured Expand, Nation Faces Shortage of 150,000 Doctors in 15 Years

The new federal health-care law has raised the stakes for hospitals and schools already scrambling to train more doctors. 
Experts warn there won't be enough doctors to treat the millions of people newly insured under the law. At current graduation and training rates, the nation could face a shortage of as many as 150,000 doctors in the next 15 years, according to the Association of American Medical Colleges.
That shortfall is predicted despite a push by teaching hospitals and medical schools to boost the number of U.S. doctors, which now totals about 954,000. 
The greatest demand will be for primary-care physicians. These general practitioners, internists, family physicians and pediatricians will have a larger role under the new law, coordinating care for each patient....A shortage of primary-care and other physicians could mean more-limited access to health care and longer wait times for patients.

However, there is some help on the way...

Proponents of the new health-care law say it does attempt to address the physician shortage. The law offers sweeteners to encourage more people to enter medical professions, and a 10% Medicare pay boost for primary-care doctors.