Having moved your wheat from where it grew to where it was needed, there was a matching need to transfer the money to pay for it. Bills of exchange, invented in Venice and Genoa, created a piece of paper that increased in value as the time for delivery of the wheat drew near, but it was the need to avoid rank profiteering in times of war that created the futures market. Standard amounts of standard quality grain made buying and selling the crop even more efficient – and saved the Union army during the Civil War in the US.

Scott Reynolds Nelson traces the ways in which the wheat trade affected financial matters in his book Oceans of Grain. The story goes far beyond merely paying for the grain, extending to huge infrastructure projects and the consequences of their failure.

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