Dispositions and Causal Powers

Dispositions are everywhere. We say that a wall is hard, that water quenches thirst and is transparent, that dogs can swim and oak trees can let their leaves fall, and that acid has the power to corrode metals. All these statements express attributions of dispositions, be they physical, physiological or psychological, yet there is much philosophical debate about how far, if at all, dispositional predicates can have complete meaning or figure in causal explanations.

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