66 . The cross price elasticity of demand for a substitute good and the income elasticity for an inferior good are:
　　Cross elasticity       Income elasticity
　　A)   < 0  > 0
　　B)    < 0  < 0
　　C)    > 0  < 0
　　67 . Assume that a perfectly competitive firm produces 10 units of a good and sells them each for a price (P) equal to $15. If the marginal cost (MC) of the 10th unit is $15 and the average total cost (ATC) is $13, economic profit for the firm is closest to:
　　A)   $20.
　　B)    $0.
　　C)    $120.
　　68 .The supply function for a good is: Quantity = ?180 + 3 × Price. At an equilibrium price of 150, producer surplus is closest to:
　　A)   12,150.
　　B)    18,225.
　　C)    24,300.
　　69 . Assume that a firm in an oligopoly market believes the demand curve for its product is more elastic above a specific price than below this price. This belief is most closely associated with which of the following models?
　　A)   Dominant firm model.
　　B)    Nash equilibrium model.
　　C)    Kinked demand model.
　　70 . Given the supply function, Qs = ?600 + 80P, the demand function, Qd = 1500 ? 70P, and an equilibrium price of 14, the amount of excess supply or demand at a price of 17 is:
　　A)   excess demand of 480.
　　B)    excess demand of 520.
　　C)    excess supply of 450.
　　
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