CONCEPT
The Scarce Complement
Varian's economic law applied to the AI age: when a resource becomes abundant, value migrates to what complements it and remains scarce—and as AI makes cognitive output abundant, the scarce complement is human judgment, taste, and the capacity to know what is worth building at all.
When a resource becomes abundant, the economic value it once commanded evaporates and migrates to whatever
complements that resource and remains scarce. Gasoline became abundant; the scarce complement was the automobile. Distribution became abundant on the internet; the scarce complement was attention. In the AI economy, cognitive output—code, analysis, prose, design, legal argument—is becoming abundant at near-zero marginal cost, and the
Varian framework predicts where value goes next: to the human capacities that direct, evaluate, and give purpose to that output. The judgment to know what is worth building. The taste to recognize when the prose is polished but hollow. The domain expertise to frame the question that the AI cannot formulate for itself. The ability to see, in the output of a generation, whether it is right. These capacities are not tasks that AI will eventually perform better; they are the activities that define what “better” means, and