There were time and motion studies in the early 20th century which found that if a city could have 2x the population then productivity would increase and per person income would increase by 7%. Currently the world is 56% urbanized. Only 10% are in megacities with population over 10m. 100% urbanization would 2x world GDP with increased productivity. Another 30% boost in productivity would come from having everyone in megacities.

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