Money is one of the important concepts, This section talks about money from the perspective of microeconomics.when people exchange goods and services without using money, this is called barter. "I'll cook dinner if you'll do the dishes" is an example of barter. Imagine an economy in wich i can sell services as a consultant to banks, but what i want is to buy a new suit. the clothing store that sell suits does not have any use for my services as a banking consultant. i sell consulting services for money, and i buy a suit using money. money serves as a medium of exchange. the bank does not sell suits. how can barter work?
Barter is an old-fashioned method we use. Now everything is different. All items have their own value and you can not exchange with strangers with items. That will increase the surplus of the market. But you can also exchange goods with people who are not afraid of holes or words to get a precious item like antiques.