This is not economics

 David Graeber, from chapter 3:

Why were cattle so often used as money ? The German historian Bernard Laum long ago pointed out that in Homer, when people measure the value of a ship or suit of armor, they always measure it in oxen-even though when they actu­ally exchange things, they never pay for anything in oxen . It is hard to escape the conclusion that this was because an ox was what one of­fered the gods in sacrifice. Hence they represented absolute value. From Sumer to Classical Greece, silver and gold were dedicated as offerings in temples. Everywhere, money seems to have emerged from the thing most appropriate for giving to the gods.

It is strangely fascinating, but it is not economics.