ARK Invest CEO Cathie Wood advises investors to shift focus from developer activity to AI agent capital flows as the primary metric for technology adoption. As autonomous software evolves to execute tasks and complete transactions independently, tracking which services agents pay for offers a more accurate reflection of real commercialization than product launches alone. Wood predicts OpenAI, Anthropic, and NVIDIA will remain central to AI infrastructure competition through 2027, with computing power, energy, capital investment, and model reliability continuing as key industry constraints. Monitoring machine payment activity is emerging as a critical method for measuring genuine AI market expansion as agents begin autonomously selecting and purchasing services.