I think I have found the most broken part of the economics section. It is energy. Trying to duplicate the examples finds that the table has ranges for things like fuel requirements and the area taken up by the power plant of that type. The Hope example just pull a couple numbers arbitrarily from the ranges. The Grinder example does so as well, plus it adds a factor for burning wood that is not mentioned anywhere. Makes building a spreadsheet for the calculations harder when there are numbers that just get made up as they go along.
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