How Does a Retailer's Service Plan Affect a Manufacturer's Warranty?

A service plan is a type of optional warranty beyond manufacturers' base warranties that retailers offer to consumers. In this paper, we examine how a service plan affects the role played by a manufacturer's base warranty. Analysis shows that when consumers can assess product quality (i.e., the probability of product failure), the manufacturer's warranty is negatively affected by the presence of a service plan. In the presence of such a plan, a base warranty is offered only when the manufacturer is very cost‐efficient in providing a warranty relative to the retailer. In this case, although the double‐marginalization problem is aggravated, offering a (limited) base warranty reduces the total warranty cost in the channel and provokes the retailer into enlarging the service plan coverage. When consumers cannot assess product quality, a high‐quality manufacturer is motivated to offer a base warranty to signal its quality. In the presence of a service plan, however, a very cost‐efficient manufacturer is discouraged from doing so.