For instance, research-intensive universities might benefit most from a hybrid of renewable long-term contracts and fringe benefit trade-offs, whereas it may be most efficient for teaching colleges to utilize a combination of contingent faculty and renewable contracts.

FORBES: Attacking Higher Ed Cost Inflation: Reform Academic Employment Policies

That last figure was supplied by the American Federation of Teachers, and it may be a little low, but it is undeniable that more than half the teaching in American colleges is done by contingent faculty (that is, adjuncts) like Professor X.

NEWYORKER: Live and Learn

For instance, many colleges have steadily increased their use of contingent, or non-tenure track, faculty.

FORBES: Attacking Higher Ed Cost Inflation: Reform Academic Employment Policies