Converting currencies in the Old World.

Abstract

Raw materials recovered from archaeological excavations in the Indus Valley, the Persian Gulf, Mesopotamia, Egypt and the eastern Mediterranean reflect the existence of long-distance trading during the Bronze Age, which united these regions into networks of commercial exchange. As each region relied on a different set of weights for trading, a straightforward conversion system must have been in operation. Here we describe a simple and universal conversion system that could have provided an economic key to the trade networks of the Old World between 2500 and 1000 bc.