We model the commonly used marketing practices of offering discounts t
o either repeat buyers (trade-ins) or new buyers (introductory offers)
of a quasi-durable good. We analyze these practices in terms of their
potential for intertemporal and third-degree price discrimination. In
our two-period model, the monopolist sets a first-period price that s
egments the second-period market optimally into holders and nonholders
of the good. In the second period, different prices are quoted to the
two market segments. We present three versions of the model with vary
ing assumptions on consumers' rationality.