The "phenomenon of free" has hit many businesses hard, particularly media businesses, argues Saul J. Berman, G...lobal & Americas Leader for the IBM Strategy & Change Consulting Group. In Not for Free: Revenue Strategies for a New World, Berman offers lessons from businesses that have integrated successful business model innovations, as well as from businesses that have failed to do so. Recently, Knowledge@Wharton and Jerry (Yoram) Wind sat down with Berman to discuss his thoughts on who pays for free content and why new models are essential.