This paper surveys the literature on m singer's book "generalization in ethics", And focuses on a problem not previously discussed: the significance of the "ceteris paribus" clause. Previous literature has pointed out the problem involved in singer's collective use of the term 'everyone', But the precise nature of the difficulty is not made clear until the issue of the ceteris paribus clause is considered. We argue that singer's argument cannot be useful in moral deliberation, Because it is not possible to (...) isolate on a particular individual who has an obligation, To see if one's own case is similar. (shrink)