Why Is Money Worth Something?

Imagine you have a shiny blue rock. It is just a rock, but your friend thinks it is cool and gives you two cookies for it. You take the rock to another friend who also likes shiny things and trade it for a toy car. The rock became valuable not because of what it is, but because of what everyone agrees it means. This is how money works. Most money today, called fiat money, is just paper or digital numbers. It has no real use on its own. You cannot eat it or wear it. However, the government says it is legal tender, and more importantly, we all trust that when we give this paper to a shopkeeper, they will accept it for bread. If everyone loses faith in the money, like people who hold too much cash during high inflation, the paper becomes less useful again. It goes back to being just a piece of paper.