The market for eyeglasses is monopolistically competitive. It follows that firms in the eyeglass industry:
a. could earn economic profit in long-run equilibrium
b. could earn economic profit in short-run equilibrium.
c. charge a price equal to marginal cost.
d. charge a price equal to the minimum average total cost.
b
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When an economy experiences deflation, investment will:
A. decrease, because businesses will not take out loans that will increase in value over time. B. increase, because businesses will take out loans that will increase in value. C. decrease, because businesses will spend cash instead of borrowing it. D. increase, because businesses will spend cash instead of borrowing it.
Fill out the table and answer the question below. 
The average product of labor when 4 units of labor are employed is
A. 22. B. 19. C. 16. D. 20.
A____________is a graph showing the various quantities supplied at each and every price that might prevail in the market.
Fill in the blank(s) with the appropriate word(s).
One of the functions of money is to serve as a:
A. completely fixed unit of measure. B. medium of exchange. C. sole way to make payments. D. valuation tool.