The book is about money. The way money started was by bartering. In the old times there were no coins. People would barter things such as jewels for meat or a cow for some pots. The coin revolution started in the middle ages. The first place the coin was invented was in an island on the Atlantic Ocean. Instead of starting of small, it started off immense. People started getting tired of carrying it around so that was when people made coins. In Lydia the first small coin was made. It would be rare to have this coin in the time we are now. After this money shifted into paper and then started the economy. That is how money became to be today.