The Economist's @econcallum explains why AI is still delivering virtually zero bottom-line gains for businesses, despite Silicon Valley's belief that anyone can adopt it with a browser: "Being here in Berkeley or San Francisco, we massively overestimate how much knowledge there is of AI across the economy. Most people do not use AI basically at all." "Most ChatGPT queries are like, ‘Give me a recipe for tomato sauce.’ It’s not, ‘How do I convert on customer outreach 15% faster?’" "The…