15.Suppose you observe that the equilibrium price and quantity of athletic shoes has risen in the last year. A possible explanation for this would be:
  1. A reduction in the cost of materials used in making the shoes.
  2. An increase in the fashionability of athletic shoes.
  3. A decrease in the price of other kinds of shoes.
  4. An increase in wages of shoe factory workers.
  5. An increase in the price of athletic socks.

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