When Generic Intros Drop Price by 60% Why Doesn't Utilization Increase?

Real interesting report from the Manhattan Institute.  They looked at generic introductions from 2000-2004 and found essentially no change in utilization at the specific drug or drug category level.  Lots of data in this report and I strongly recommend you take a look.  They even looked at sampling and the impact of therapeutic substitution following generic introductions (e.g., impact on Lipitor when Zocor went generic).