 [T]rade, however multilateral, does not constitute a cooperative scheme of the relevant kind. Trade, if freely undertaken, is (presumably) beneficial to the exchanging parties, but it is not, it seems to me, the kind of relationship giving rise to duties of fair play.…Trade in pottery, ornamentation, and weapons can be traced back to prehistoric times, but we would hardly feel inclined to think of, say, the Beaker Folk as forming a single cooperative enterprise with their trading partners. No more did the spice trade unite East and West. (Barry 1982: 233)