 So far we have examined some contrasts between special obligations and both consequentialist duties and natural duties, and have also discussed two objections to special obligations, the voluntarist objection and the distributive objection. In discussing responses to the voluntarist objection, some accounts of the grounds of special obligations were considered. But there are some other important accounts that deserve mention. Given the number of types of special obligations that commonsense recognizes, presenting the various accounts that have been offered of their grounds would be a book-length task. So the following discussion of the grounds of special obligations should not be taken as in any way exhaustive.