In any case, it would be silly to ignore the possibility of what Keynes called “technological unemployment”, the notion that advances in technology can destroy certain forms of traditional employment or render them unskilled and low paid. We may be seeing quite a bit of that today. In the post-war period, middle income employment has been extensively supported by explosive growth in white collar work. Much of this is now being made redundant by computers. This may over time accentuate the differences between high-skilled, high-paid, and low-skilled, low-paid work. Advances in robotics and artificial intelligence threaten to greatly accelerate the process, progressively making some forms of work essentially worthless.