Jim and Lisa own a dog-grooming business in Champlain, New York, called JL Groomers. There are many buyers and many sellers in the dog-grooming service market. JL Groomers experiences normal cost curves, with the marginal cost (MC) curve crossing average variable cost (AVC) at $14 and average total cost (ATC) at $22. JL Groomers' long-run supply curve would be the:

a. marginal revenue (MR) curve above $14.

b. marginal revenue (MR) curve above $22.

c. marginal cost (MC) curve above $14.

d. marginal cost (MC) curve above $22.

e. average variable cost (AVC) curve above $14.

The answer is marginal revenue (MR) curve above $22.

Explanation:

Jim and Lisa Groomers will maximize its accounting profit when taking it to 0 its economic profits when marginal revenue = marginal costs.

Economic profits are not the same as accounting profits because they include the opportunity costs of investing the money somewhere else. That is whythe long run firm is not able to make economic profits since as they exist, new competitors will enter the market. But in the case of the shoert run, the firms are able to make economic profit, but by doing so, they cannot maximize their accounting profit.

Economic profit = account profit = Opportunity profit

Opportunity cost are extra costs or benefitslost from choosing one activity or investment over another one.