This article argues that recent growth in prescription drug spending for a large segment of the population coupled with slower growth in inpatient care spending has lessened the concentration of healthcare expenditures in the U.S. 

Zuvekas, S. H., & Cohen, J. W. (2007). Prescription drugs and the changing concentration of health care expenditures, Health Affairs, 26(1): 249-57. DOI: 10.1377/hlthaff.26.1.249. http://content.healthaffairs.org/cgi/content/abstract/26/1/249 © 2007 by Project HOPE.

Authors: Samuel H. Zuvekas, Joel W. Cohen