Simplification is often incredibly helpful in understanding complex issues. There are hundreds of examples of such to draw on from science and economics. In Yaron Brook's video presentation, however, we have a wonderful example of how making things more simple than is possible takes us backwards to more, rather than less, muddled thinking.
I was flabbergasted by entrepreneur, Yaron Brook's, presentation at Exeter. It was oversimplified to a fault, and at times embarrassingly wrong. He should have left economics to the economists, and chosen instead to speak about finance -- a topic he presumably knows something about. He, by self description, is an "Objectivist," just as Alan Greenspan was before his awakening. [Greenspan never dreamed bankers would act against their own best interests, until they did exactly that!] Objectivism, has not stood up well to close inspection and the test of time.
Brook deserves some applause for recognizing that the source of wealth is productivity. Good! He tells us that the wealth gap in itself is not the problem, and so attempting to reduce it willy-nilly, say, via a wealth tax, or whatever, is unlikely to benefit those unlucky souls who find themselves on the other end of the distribution. We won't get to the promised land by making the rich less rich. Fine so far, but beyond that it's mostly downhill. His brakes fail on a 15 percent grade and he heads for the cliff. This is a badly argued presentation by an arrogant American at a run of the mill British University, and it's badly rebutted by the students.
Brook might have considered the sociopolitical impact of a extremely lop-sided wealth gap, since it can endanger democracy in nominally democratic countries. He didn't do that though. Perhaps it is for the best, because if his reasoning on sociopolitical matters is anything approaching that on economics, the damage wrought on young brains might have been worse.