The traditional theory of second-degree price discrimination tackles individual self-selection but does not address the possibility that buyers could form a coalition to conduct arbitrage. We study the optimal sale mechanism that takes into account both individual and coalition incentive compatibility. We show that the monopolist can achieve the same profit regardless of whether or not buyers can form a coalition. Although marginal rates of substitution are not equalized across buyers of different types in the optimal sale mechanism, they fail to realize the gains from arbitrage because of the transaction costs in coalition formation generated by asymmetric information.
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