> There’s really not much question we are in a giant bubble

IIUC, some indicators correlated with previous bubbles are lighting up now, which is being interpreted as evidence that AI is likewise a bubble. But what about indicators of previous non-bubbles? How did it look when textile mills were first industrialised, or kerosene replaced whale oil for lighting, or the electric grid became widespread, etc. -- real advances that materially increased productivity in a lasting way? If these same indicators lit up in those cases too, how can we distinguish bubble from genuine advance?