Some of the greatest minds in the industry have come to opposite conclusions about things. Peter Drucker emphasized the importance of gaining new customers, and Andrew Ehrenberg and Byron Sharp doubled down on this principle with layers of empirical purchase data and math. Larry Light and Mike Donahue insist that focusing ad spend on profitable loyals provides the highest profits. Joel Rubinson, Leslie Wood and myself point out with even bigger and better datasets, that ads do the most work among occasional buyers of a given brand (which Byron calls "light users").
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