The average avoidable cost for a fringe firm is AAC(q)=20/q+5q. The marginal cost function for a fringe firm is MC=10q. There are 10 fringe firms . The marginal cost of the dominant firm is 2 and the demand function ia Q= 100-p a) what is the supply function of the fringe b) what is the residual demand function for the dominand firm? c) what is the profit maximising price of dominans firm d) compare monopoly profits to the profit of the dominans firm. Which market structure is socially preferable, dominant firm or monopoly ?why?