The Robustness of Exclusion in Multi-dimensional Screening

We extend Armstrong’s result on exclusion in multi-dimensional screening models in two key ways, providing support for the view that this result holds true in a large class of models and is applicable to many different markets. First, we relax the strong technical assumptions he imposed on preferences and consumer types. Second, we extend the result beyond the monopolistic market structure to some oligopoly settings. We illustrate the results with several examples and applications.