8. In the short run, a perfectly competitive firm earning negative economic profit is a. on the downward-sloping portion of its ATC curve. b. at the minimum of its ATC curve. C. on the upward-sloping portion of its ATC curve. d. above its ATC curve.

4. A competitive firm’s short-run supply curve is its________ cost curve above its ________ cost curve.a. average total, marginalb. average variable, marginalc. marginal, average totald. marginal, average variable

A perfectly competitive firm faces the short-run cost schedule shown in Table 1. A)  Calculate average total cost (ATC=TC/Q), marginal cost (MC=∆TC/∆Q) and marginal revenue (MR=∆TR/∆Q) for each level of output. The price per unit of output is £16. B) Plot ATC, MC and MR on a graph and mark the profit-maximising output. At what output is profit maximised? C) How much profit/loss is made at the optimum level of output?

A perfectly competitive firm faces the short-run cost schedule shown in Table (a)Calculate average total cost (ATC=TC/Q), marginal cost (MC=ATC/AQ) and marginal revenue (MR-ATR/AQ) for each level of output. The price per unit of output is £16 b) Plot ATC, MC and MR on a graph and mark the profit-maximising output. At what output is profit maximised? c) How much profit/loss is made at the optimum level of output? Assume market price declines to £9 per unit. If the firm's average variable cost is £9.5, should the firm shut down in the short run? In the long run? Explain. If the firm is typical of other firms, what price will it charge in the long run? Explain.