Stripe chief economist @ernietedeschi on why task-level AI productivity gains are quietly not what's driving America's macro productivity surge: "At the task level, at the worker level, we're seeing explosive task-level productivity gains from AI. We're also seeing a surge in aggregate productivity when we look at the entire business sector. It seems like one must just be an aggregation of the other. But that's probably not what we're seeing." "When you look at industry-level productivity,…