"The American Indians were Communists. They were. Every anthropologist will tell you they were Communists. No rich, no poor. If somebody needed something the community chipped in."

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We chose to do this work mathematically, which has the advantage of precision but is not always appreciated by readers. It is perhaps for this reason that anthropologists have not shown much interest in these models, unlike economists, for example, for whom the use of mathematics poses no problem. However, one could reach the same conclusions by using just a bit of common sense.

— Luigi Luca Cavalli-Sforza