Origin and functions of money

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Across
  1. 5. - not common; hard to find.
  2. 6. - gives permission to do something.
  3. 9. - to become worse over time.
  4. 13. - has as part of a whole.
  5. 14. - the state of being clean and free from dirt.
  6. 17. - very important and necessary.
  7. 18. - to take control of a place or people.
  8. 19. - good quality or acceptable.
Down
  1. 1. - to get or obtain something.
  2. 2. - continuing for a long time.
  3. 3. - money used in a country.
  4. 4. - something valuable that you own.
  5. 7. - in spite of that; however.
  6. 8. - desired or wished for by someone.
  7. 10. - able to be divided into parts.
  8. 11. - to trade goods or services without using money.
  9. 12. - gold or silver in bars or ingots.
  10. 15. - the place where something comes from.
  11. 16. - a path or line that you follow.