Or put another way, when societies had to use largely sutalinabse resources, there was greater scarcity, so inflation was more likely. Malthus supposedly based his early thoughts on that history. Fossil energy reduced the scarcity of most things by providing ample energy.What a concept though. They went to fiat currencies because they had a harder time maintaining inflation, because energy became ample? It also makes sense because energy could be used to replace labor, and was, in many industries.