That computers don't seem to be correlated with productivity improvements is a thing. And also despite the huge valuations of tech companies, their secondary ef

That computers don't seem to be correlated with productivity improvements is a thing. And also despite the huge valuations of tech companies, their secondary effects on the economy appear to become negative quickly. That's very much unlike for instance GM in the 1950's. Where GM had a huge valuation. And spawned secondary businesses that themselves had large collective valuations.