What is Money Level 4

3. The ancient Greek philosopher who said money exists not by nature but by law.
6. The bean used as money in Mexico and Central America.
7. The function of money that lets a person hold value over time. The ___ of value.
9. The material that a money is made of, like metal, paper, or shells.
11. The seventh property of money. The system around the money cannot be changed by people who would benefit from changing it.
12. The ancient place in what is now Turkey where the first stamped metal coins were made.
14. The function of money that lets people compare the values of different things. The unit of ___.
15. What people do when they exchange one thing for another. Money makes this easier.
16. The Greek word for money that comes from a word for custom or law.
18. The main money of the United States today.

1. What money is, according to the reading. Something people made, not something found in nature.
2. The new kind of money that started working in 2009 with a fixed supply and a public record.
3. The first property of money. People in a community have to be willing to take the substance in exchange.
4. The function of money that lets two people trade even when neither one wants what the other has.
5. The Greek word for custom or law.
8. The problem that what counts as money depends on what people grew up with.
10. The group that has to recognize a thing for it to work as money.
12. A record of who owns what.
13. The unit of rice that was money in old Japan.
17. A small ocean shell used as money in Asia and Africa for over a thousand years.