Consider the facemask industry which is a monopolistically competitive industry in Home country. First, we assume all firms have the same cost function for producing masks: = , with fixed cost = $15,000 and the marginal cost = $20 per package of masks. Moreover, for a monopolistically competitive firm, we assume the demand in Home is given by = [ 1/ ( )] where Q is an individual firm's sale, S is the total sales of the industry, n is the number of firms in the industry, P is the price charged by the firm itself, and is the average price charged by its competitors. represents the intensity of competition and is assumed to be 0.6