In the case of perfectly elastic supply, the supply curve is:
A. upward sloping.
B. downward sloping.
C. vertical.
D. horizontal.
Answer: D
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Refer to the figure below.________ inflation will eventually move the economy pictured in the diagram from short-run equilibrium at point ________ to long-run equilibrium at point ________. 
A. Rising; A B. Falling; A; C C. Falling; B: C D. Rising; A; C
The marginal revenue curve faced by a perfectly competitive firm
A. is downward sloping, because price must be reduced to sell more output. B. lies below the firm's demand curve. C. is horizontal at the market price. D. has all of these characteristics.
Bargain airline fares in which airlines charge varying rates to passengers for the same flight and service is an example of
A. market penetration. B. transaction pricing. C. collusion. D. price discrimination.
Refer to the above diagram showing the average total cost curve for a perfectly competitive firm. Suppose that average variable cost is $8 at 40 units of output. At that level of output, total fixed cost:
A. is $2.
B. is $40.
C. is $80.
D. cannot be determined from the information provided.