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?
That's exactly the problem of barter, there's no certain standard for having equal things bartered. That's why money is better because it has value and almost all people in the world has accepted it as the system to do transaction to exchange barter, changing the complicated system with the better one. It's indeed working, and perhaps it will even be better when bitcoin cooperated with fiat in daily life, it would be even easier I guess.