This paper examines the impact of disability on wellbeing and presents arguments against the mere-difference view of disability. According to the mere-difference view, disability does not by itself make disabled people worse off on balance. Rather, if disability has a negative impact on wellbeing overall, this is only so because society is not treating disabled people the way it ought to treat them. In objection to the mere-difference view, it has been argued, roughly, that the view licenses the permissibility of causing disability and the impermissibility of causing nondisability. In her recent article, “Valuing Disability, Causing Disability” (2014), Elizabeth Barnes attempts to show that this causation-based objection does not succeed. W...