You have trouble understanding this? Try this: can 90% of the population live in cities, supported by food and oil produced by the other 10%? The answer is ye

You have trouble understanding this? Try this: can 90% of the population live in cities, supported by food and oil produced by the other 10%? The answer is yes. Now, can 90% of the population live with the farmers and oil workers (in a very rural lifestyle) and still yield the level of civilization and economic development we have now? The answer is no. Without cities, there's no modern economy: just look at any place that's still agrarian, or was in the recent past. Or even the US during its civil war (the agrarian, rural South had no chance against the industrialized North).