A particular builder can be described in many ways but as the efficient aitiai of a particular house he is described as ``this builder actually building (Physics , 41 . So , although we can casually and elliptically refer to all kinds of things as efficient aitiai , when we are precise we will see that the actual causally explanatory item is a state or an event involving some substance . For , to be causing some change , the substance must be actualizing some disposition which...











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