Explain why a perfectly competitive firm will
shut down in the short run if price is lower than average variable
cost but will continue to produce if price is below average total
cost but above average variable cost.
In long-run competitive equilibrium, P = MC = SRATC = LRATC.
Because P = MR, we can write the preceding condition as P = MR = MC
= SRATC = LRATC. The condition thus consists of four parts: (a) P =
MR,...