Economics Refresher Puzzle

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Across
  1. 2. A compulsory charge imposed by the government on goods or income
  2. 6. The next best alternative that is given up
  3. 9. A situation where there is excess demand
  4. 10. The point at which quantity demanded equals quantity supplied
Down
  1. 1. The unlimited desires people have
  2. 3. The willingness and ability to sell a product at a given price
  3. 4. A good for which demand increases as income rises
  4. 5. A point outside the PPF that cannot currently be achieved
  5. 7. A payment from the government to producers to reduce costs and lower prices
  6. 8. Resources are limited in supply
  7. 11. A good for which demand decreases as income rises