Explain the history of money

Basically a medium of exchange became necessary because the barter system is inefficient. Carting large quantities of goods from place to place to exchange for other goods is very inefficient

Paraclete put a lot of thought into his post. I'm going to be less forthcoming and say only this "do you own homework". :)

Hey Bobby, you will get many more answers to your question by using a search engine like Google. Let me google that for you