Commodity market in Sumer between 4500 BC and 4000 BC. Sumerians first used clay tokens sealed in a clay vessel, then clay writing tablets to represent the amount—for example, the number of goats, to be delivered. These promises of time and date of delivery resemble futures contract. Early civilizations variously used pigs, rare seashells, or other items as commodity money. Since that time traders have sought ways to simplify and standardize trade contracts. Gold and silver markets evolved in classical civilizations. At first the precious metals were valued for their beauty and intrinsic worth and were associated with royalty. In time, they
Latin American economy U.S. government pursued foreign-policy objectives. Post-war commodity prices were unstable, there was an oversupply of commodities, and some governments attempted to manipulate commodity prices, such as Brazil's attempt to raise coffee prices, which in turn caused Colombia to increase its production. Since most Latin American countries had been dependent of the commodity export sector for their economic well-being, the fall in commodity prices and the lack of increase in the non-export sector left them in a weak position. Manufacturing for either a domestic or export market had not been a major feature of Latin American economies, but some steps had