We extend the Areeda–Turner rule to two-sided markets. We show that a two-sided monopolist may find it short-run profit-maximizing to charge a price below marginal cost on one side of the market. Hence showing that the price is below marginal cost on one side of a two-sided market cannot be considered a sign of predation. We then argue for a two-sided Areeda–Turner rule that takes into account price-cost margins on both sides of the market. Two examples highlight that applying a one-sided Areeda–Turner rule may lead one to assess legitimate prices as predatory or to consider predatory prices as legitimate.
Review of Industrial Organization – Springer Journals
Published: Apr 18, 2015
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