suppose that at one of the talbot's shops, marginal cost of a coat is constant at $150, and total fixed cost is $3,000 a day. the shop maximizes its profit by selling 15 coats a day at $500 per coat. then the shops nearby increase their advertising. the talbot shop responds by spending $1,500 a day more on advertising its coats. as a result, its profit-maximizing number of coats sold increases to 25 a day at $400 per coat. in the scenario above, as a result of increased advertising, talbot's average total cost