Energy is not simply one commodity among others; it is the ur-commodity, the foundation for all economic activity. It follows laws of its own – the laws of thermodynamics, notably – which are not the same as the laws of economics, and when the two sets of laws come into conflict, the laws of thermodynamics win every time.
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Energy is different. Once you turn the energy content of a few million bushels of grain into a pyramid, say, by using the grain to feed workers who cut and haul the stones, that energy is gone, and you cannot turn the pyramid back into grain; all you can do is wait until the next harvest. If that harvest fails, and the stored energy in the granaries has already been turned into pyramids, neither the market economy of goods and services or the abstract system of distributing goods and services can make up for it. Nor, of course, can you send an extra ten thousand workers into the fields if you don't have the grain to keep them alive.
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