  The Exclusion Problem presents us with a picture on which  higher-level mental properties compete with their  lower-level physical realizers. Physical properties are  unproblematically relevant in the production of behavior, and so  mental properties must either find a way to do the work that their  realizers are already doing or face exclusion. But some philosophers  would insist that this picture is deeply misleading: mental  properties enjoy causal relevance in their own right and are not  threatened by exclusion from physical properties.