The logic is perfectly circular. If precious objects were moving long distances, this is evidence of ‘trade’ and, if trade occurred, it must have taken some sort of commercial form; therefore, the fact that, say, 3,000 years ago Baltic amber found its way to the Mediterranean, or shells from the Gulf of Mexico were transported to Ohio, is proof that we are in the presence of some embryonic form of market economy. Markets are universal. Therefore, there must have been a market. Therefore, markets are universal. And so on. All such authors are really saying is that they themselves cannot
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