Full Idea
Rule-utilitarianism seems either to collapse into act-utilitarianism, or else it is only partly utilitarian.
Gist of Idea
Rule-utilitarianism is either act-utilitarianism, or not really utilitarian
Source
Jonathan Glover (Introductions to Utilitarianism and its Critics [1990], Pt Six)
Book Reference
'Utilitarianism and Its Critics', ed/tr. Glover,Jonathan [Macmillan 1990], p.196