Heck, computer programmers had no existence until computers. At one point a computer was just someone who was very good at math performing calculations all day...it took a year to check all of the calculations needed to produce the atomic bomb and that work was all done by humans. Imagine how history might be different if even one of them had a pocket calculator. You get the idea. New technology inspires new jobs.
He also argues that historically automation eliminates jobs that were "dull, dirty, and dangerous," and that automation also ends up performing previously-nonexistent jobs -- or work that was forced onto customers in self-service scenarios.
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