Because this market is a monopolistically competitive market, you can tell that it is in long-run equilibrium by the fact that at the optimal quantity for each firm. Furthermore, the quantity the firm produces in long-run equilibrium is the efficient scale. True or False: This indicates that there is a markup on marginal cost in the market for shirts. True

Because this market is a monopolistically competitive market, you can tell that it is in long-run equilibrium by the fact that P = ATC, P>ATC, MR =MC, or MR>MC at the optimal quantity.  Furthermore, the quantity the firm produces in long-run equilibrium is the efficient scale. True False

This indicates that there is a markup on marginal cost in the market for shirts. True False

Explanation:

In the long run, monopolistically-competitive entities produce at a level where marginal cost and marginal revenue are equal. This makes it impossible for individual companies to sell their products at prices above the average cost. This situation means that monopolistically-competitive companies will always earn zero economic profit in the long run.