It was made by Robert Zubrin when he was talking about the benefits of developing technology and how they increase the resources available to people and possibilites of what can be done. The book was not a dedicated history book but did have some history in it.
The claim that common people never had access to bronze seems a little bit dubious to me. I suspect that there was a mix of new, bronze tools along with older fashioned stone tools like in the neolithic era. If so what tools were changed to be made of bronze and what continued to be made out of stone.
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