4. Answer the following: a. List 4 goods or services that you have purchased that were produced by an oligopolist. Why are these industries oligopolistic rather than monopolistically competitive ? Explain using the technical concepts from the relevant chapters . b. Why is mutual interdependence important under oligopoly, but not so important under perfect competition, monopoly or monopolistic competition? Elaborate in detail. c. Consider this statement: acceBecause price equals long run average total cost, and profits are zero, a monopolistically competitive firm is an efficient as a perfectly competitive firm.at Do you agree or disagree? Elaborate in detail. d. Why might OPEC members have a difficult time setting and maintaining a monopoly price? e. If an oligopolist knows rivals will match a price cut and not price increase, would be ever tamper with the existing price? What kind of market outcome will that generate? f. How do new product offerings like breakfast sandwiches by one restaurant chain affect othersaETM sales and profits