Abstract
The records of trading between Africans and Europeans on the Guinea Coast since antiquity raise issues the practical resolution of which has never ceased to occupy economic historians. The Herodotean inadequacies of dumb barter in Carthaginian goods and in gold dust were fully resolved only at the time of the eighteenth-century slave trade. In Senegambia and even on the Windward Coast, as we now know, the Royal African Company had still to go without an effective profit-and-loss accountancy. With the advent of the regular slave trade two new commercial devices had to be introduced by the Europeans. Both the ‘sorting’ and the ‘ounce trade’ sprang from the vital need for adjustment between the radically different trading methods of Europeans and Africans. And it was not so much a case of mutual adjustment, for of the two systems only one, the European, adjusted.

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