Monopolies Good, Bad, What If's

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On the matter of competition in duopolies, it can only exist in the non price arena. Such as in the good old days, Ansett and Qantas. Of course the best way to achieve and encourage competition is to allow easy entry into the market. Paul Keating, a great Australian who either did not understand competition or had his reasons for avoiding doing some good allowed Qantas to buy TAA (or 'Australian Airlines" as it was then). Thus cementing a duoploly Qantas (+ Australian) v Ansett, where he should have allowed a foreign airline to buy Australian, thereby creating a three firm market where collusion between two would not dictate prices and quantities offered.