Throughout the nineties, while management consultants were raving about the joys of 100% customer satisfaction and retention, Clancy presented work at professional conferences, which demonstrated for the first time the non-linear relationship between customer satisfaction, customer loyalty and marketing profitability. Data shows that as satisfaction and retention increase, so does profitability up to a point. But with ever increasing levels of satisfaction and retention, the cost of keeping customers happy and retaining them causes profitability to decline. This finding, now considered axiomatic in our profession, was first published in Clancy & Shulman’s The Marketing Revolution: A Radical Manifesto for Dominating the Marketplace (with Robert S. Shulman), New York: Harper Business - A Division of Harper Collins Publishing (1991).