28-Which of the following is the best example of a natural monopoly? A) owning the only licensed taxicab in town B) the United States Postal Service C) ownership of the only ferry across Puget Sound for twenty miles D) the cable television company in your hometown 29-If a monopolistically competitive seller can convince buyers that its product is of better quality and value than products sold by rival firms, A) demand increases. B) the firm gains more control over its price. C) demand becomes more inelastic. D) all of the above occur