
Before the industrial revolution there was plenty of work for everyone - not always pleasant and nice - but there was a huge demand for muscles and brains.
Mechanization took most low level, handcraft, agricultural and production jobs away, so humans had to train to be smarter than machines to keep working. Most of today’s productive work (= producing goods) is done by machines, while we have kept and expanded the so called service industries and administration (and boy, do we love our bureaucracies).
I wonder: when we run out of oil and don’t come up with an adequate supply of alternative fuel if human work might be back in demand? There are six billion of us and not everybody fancies burger flipping and filling out forms & papers.