For example, suppose you want to replace a sweater with a boom box. To get a boombox, you need to find someone who wants to replace the boombox with a sweater. However, it is very difficult to find such a perfect person.
But in the old days, when there was no money, the only way was to exchange goods for goods in this way.
However, even they came to feel that this was very inconvenient. Gradually, they began to use things instead of money, such as clean shells. For example, clean seashells. If the shells were something that everyone wanted, they would first exchange their own shells for the shells. After that, you could exchange the shell for something else that you wanted.
This seems to be how money began. However, because it was so long ago, the details are not well understood.
Later on, money was not made from shells, but from real money. However, the details of the first appearance of money are still unknown. After all, it was more than 3,000 years ago.
However, it is clear that money was created in Greece at least 2,700 years ago. This is now considered to be the first money in the world, but there may have been older money.