<P> After the domestication of cattle and the start of cultivation of crops in 9000 - 6000 BCE, both livestock and plant products were used as money . </P> <P> In the earliest instances of trade with money, the things with the greatest utility and reliability in terms of re-use and re-trading of these things (their marketability), determined the nature of the object or thing chosen to exchange . So as in agricultural societies, things needed for efficient and comfortable employment of energies for the production of cereals and the like were the most easy to transfer to monetary significance for direct exchange . As more of the basic conditions of the human existence were met to the satisfaction of human needs, so the division of labour increased to create new activities for the use of time to solve more advanced concerns . As people's needs became more refined, indirect exchange became more likely as the physical separation of skilled labourers (suppliers) from their prospective clients (demand) required the use of a medium common to all communities, to facilitate a wider market . </P> <P> Aristotle's opinion of the creation of money as a new thing in society is: </P> <P> When the inhabitants of one country became more dependent on those of another, and they imported what they needed, and exported what they had too much of, money necessarily came into use . </P>

Who came up with the idea of money