This piece in Bloomberg is disappointingly short. Money quote:
At universities nationwide, employment of administrators jumped 60 percent from 1993 to 2009, 10 times the growth rate for tenured faculty. “Administrative bloat is clearly contributing to the overall cost of higher education,” says Jay Greene, an education professor at the University of Arkansas. In a 2010 study, Greene found that from 1993 to 2007, spending on administration rose almost twice as fast as funding for research and teaching at 198 leading U.S. universities.
Again, the piece overall is a bit short. Would be nice to see some serious thinking about the causes of this shift (other than the aortic one).