Debt: The First 5,000 Years

by David Graeber

One much-repeated story held that the Prophet himself had refused to force merchants to lower prices during a shortage in the city of Medina, on the grounds that doing so would be sacrilegious, since, in a free-market situation, “prices depend on the will of God.”82 Most legal scholars interpreted Mohammed’s decision to mean that any government interference in market mechanisms should be considered similarly sacrilegious, since markets were designed by God to regulate themselves.83 If all this bears a striking resemblance to Adam Smith’s “invisible hand” (which was also the hand of Divine Providence), it might not be a complete coincidence. In fact, many of the specific arguments and examples that Smith uses appear to trace back directly to economic tracts written in medieval Persia. For instance, not only does his argument that exchange is a natural outgrowth of human rationality and speech already appear both in both Ghazali (1058–1111 AD) and Tusi (1201–1274 AD); both use exactly the same illustration: that no one has ever observed two dogs exchanging bones.84 Even more dramatically, Smith’s most famous example of division of labor, the pin factory, where it takes eighteen separate operations to produce one pin, already appears in Ghazali’s Ihya, in which he describes a needle factory, where it takes twenty-five different operations to produce a needle.