(c) What happens to Sleek's price, output, and profit in the long run? Explain this change in words, and show it on a new diagram. (3 分)

(d) Suppose that over time consumers become more focused on stylistic differences among shoe brands. How would this change in attitudes affect each firm's price elasticity of demand? In the long run, how will this change in demand affect Sleek's price, output, and profit? (2 分)