ECON1010 Lecture Notes - Lecture 4: Average Variable Cost, Marginal Cost

7.) At the level of output where marginal revenue equals marginal cost, assume that the price of a competitive firm's product is between the firm's average total cost curve and its average variable cost curve. In this case the firm would
A. decrease output to reduce the costs.
B. continue to operate in the short run.
C. shut down.
D. increase output to increase profit.
8.) The lowest point on the firm's long-run supply curve is
A. the shutdown point.
B. the break-even point.
C. between the shutdown point and the break-even point.

 Consider a firm whose technology is given by the production function: y = f (K,L) = (N+1)L + 2√K. Assume that input prices for labour, L, and capital, K, are w = 1 and r = 2 respectively. a)Find the firm’s short run total cost function assuming the firm cannot hire more workers nor fire its only worker, i.e. L = 1 is fixed. 

b)Find the firm’s short run marginal cost, average variable cost and average fixed cost. Draw the three of them in the same graph. What is the short-run supply of the firm?

c)Find the firm’s long run total cost function, i.e. when all factors are variable. 

d)Find the firm’s long run marginal cost and average cost. Draw them in the same graph. What is the long-run supply of the firm?

10-When marginal cost is greater than average total cost,
A. Average total cost must be increasing with output
B. Average variable cost must be decreasing with output
C. Average fixed cost must be increasing with output
D. Marginal cost must be increasing with output

11-If a firm's demand curve falls below its AVC curve, then the firm should
A. Shut down now
B. Operate in the short run but not the long run
C. Set price = marginal cost
D. Shutdown in the long-run

12- The demand curve facing a perfectly competitive firm is
A. Upward sloping
B. Perfectly inelastic
C. Downward sloping
D. Perfectly elastic

13-If the demand curve falls below the ATC curve but lies above AVC, then the firm should
A. Should shut down
B. Operate in the short run but not the long run
C. Set price = marginal cost
D. Operate in the short run and the long run

14-At the output where MC = ATC = P, the perfectly competitive firm
A. Should shutdown
B. Has no economic profit
C. Is not profit maximizing
D. Should raise output