The diagram at right shows the various short-run cost curves for a perfectly competitive firm. a. Based on the diagram and the assumption that the firm is maximizing its profit, fill in the following table. The last three columns require only a 'yes' (Y) or 'no' (N). MC Is Price > ATC? Firm's Output Is Price > AVC? Market Price ($) Are Profits Positive? $10 ATC $4 $5 ON AVC OOOD $7 $7 00000 $8 $5 $10 b. What is this firm's shut-down price? $ since this is where is at its minimum. $4 M.. c. The firm's supply curve is :135 155170190210 Output O A. the MC curve above $5. OB. the MC curve above $4. OC. the MC curve above $7.25. OD. the MC curve above $7. O E. not shown in this graph