Before the money appeared, barter was popular. The goods were exchanged. For example, a person has a basket and another has a piece of cloth, they make an exchange which is good for both of them. But such exchange has its limits. What to do if a person who wants to exchange his piece of cloth doesn’t need a basket? It means that a seller doesn’t have the same needs as the buyer and vice versa. In such a situation, people needed the unique currency, and they invented it. The metal coins appear...