Abstract
This paper provides an economic analysis on the choice of backward compatibility by a durable goods monopolist in the presence of network effects. We examine the time inconsistency problem faced by a monopolist in its dynamic provision of two compatible products. We suggest an economic reason why, and when it will be strategically optimal, for the monopolist to choose backward compatibility even though it is socially undesirable, and not to choose forward compatibility even though it is technologically possible. We also investigate the compatibility choices with and without price discrimination, and compare market outcomes with the social optimum. Two different social inefficiencies (planned obsolescence) which arise from the viewpoints of optimal consumption and optimal compatibility are discussed.
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