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The Specialness of Zero

. Working Paper, 26485. National Bureau of Economic Research, (November 2019)
DOI: 10.3386/w26485

Abstract

A model is provided whereby a monopolist firm chooses to price its product at zero. This outcome is shown to be driven by the assumption of ‘free disposal’ alongside selection markets (where prices impact on a firm’s costs). Free disposal creates a mass point of consumers whose utility from the product is zero. When costs are negative, the paper shows that a zero price equilibrium can emerge. The paper shows that this outcome can be socially optimal and that, while a move from monopoly to competition can result in a negative price equilibrium, this can be welfare reducing. The conclusion is that zero can be a ‘special zone’ with respect to policy analysis such as in antitrust.

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The Specialness of Zero

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