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Market-of-One is Rohit Prabhakar's AI personalization strategy that replaces mass segmentation with hyper-personalization at individual scale. Built on the belief that every customer is their own market, this framework delivers real-time, individual-level experiences across every touchpoint. Tested at McKesson, it generated $900 million in new revenue and $40 million in cost savings. Applied at Visa across 200 countries and hundreds of millions of customers, Market-of-One proves that personalization at scale is no longer a vision — it is a commercial reality. Stop marketing to segments. Start serving individuals. The era of the segment is over.