The paradox of value

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Across
  1. 4. A transparent, extremely hard precious stone that is used in jewellery, and in industry for cutting hard things
  2. 5. A person who studies or has a special knowledge of economics
  3. 9. A fact or event that makes a situation the way it is
  4. 12. An amount of food given to one person at one time
  5. 13. To walk around slowly in a relaxed way or without any clear purpose or direction
  6. 15. A situation or statement that seems impossible or is difficult to understand because it contains two opposite facts or characteristics
  7. 16. Something dangerous or serious, such as an accident, that happens suddenly or unexpectedly and needs fast action in order to avoid harmful results
  8. 17. Necessary for the success or continued existence of something; extremely important
Down
  1. 1. The things you must have for a satisfactory life
  2. 2. Something difficult or unpleasant that you have to deal with or worry about
  3. 3. Using ideas and methods that have never been used before
  4. 6. The amount of money that can be received for something
  5. 7. To get something
  6. 8. Not having the normal amount of water in your body so that you feel ill or weak
  7. 10. The usefulness of something, especially in a practical way
  8. 11. Feeling as if you are going to vomit
  9. 14. An area, often covered with sand or rocks, where there is very little rain and not many plants