Firms frequently compete across multiple segments. Such multimarket contact has been shown to deter aggressive competition, leading to what has been termed quot;mutual forbearance.quot; Empirical support for this phenomenon derives mainly from studies of the direct effects of multimarket contact...

We consider customer influences on market structure, arguing that market structure should explain the extent to which any given set of market offerings are substitutes or complements. We describe recent additions to the market structure analysis literature and identify promising directions for...