 A reply to this last objection might be that even if one has explained in this way the existence of each individual in the contingent series, one still has not answered the two questions mentioned earlier: Why is there a world at all rather than none? and: Why does this world exist and not some other world? (for further discussion, see Rowe 1975; Swinburne 2004; Pruss 2006; O’Connor 2008).