When you are in healthcare, all you ever hear about is how tight the margins are and how important it is to manage costs. Obviously, healthcare has produced a lot of wealth over the years for a lot of people. In my time at Express Scripts, the stock when from $37 in 2001 to (split adjusted) about $180 when I left in 2006. (Not bad)
I thought this chart which I found in an IBM publication did a good job of portraying how the investment market has viewed and rewarded healthcare. This is based on a payor (HMO) index. The PBM index would probably be even higher over that same time period as Medco, Express Scripts, and Caremark have grown immensely over the past decade.