For two years the enterprise question about AI has been which model is best. That was always the wrong question, or at least an incomplete one. The better question is who keeps the learning that happens once a company actually uses a model. Satya Nadella has given the problem a name. In a short essay published on X, he described what he calls the Reverse Information Paradox. The old paradox, from the economist Kenneth Arrow, was the seller's problem: to sell information you h