When all production costs for a monopoly are fixed [MC =0], in that case economic profit: (i) falls when price is raised in the inelastic range of a demand curve. (ii) rises when price is cut in the inelastic range of a demand curve. (iii) is maximized at the output level where marginal revenue is zero. (iv) falls when price is cut within the elastic range of a demand curve. (v) is precisely proportional to the price the monopolist charges.
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