Although I agree that today's food shortages could be solved by better distribution (and a considerable number of westerners tightening their belts), weather still plays a role. In the West we don't notice it because we can simply get our food from somewhere else. And governmental and economic failures played a role in historical famines as well. Didn't Julian the Apostate try to solve a food-shortage in Antioch by fixing the grain-price? The grain-merchants responded by keeping the grain of the market. Julian was not the first (and presumably not the last) ruler to make that mistake.
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