 Not all false or misleading beliefs count for Marx as ideological. Honest scientific error, for example can be non-ideological. And ideological belief can be misleading without being strictly false. For example, defenders of the capitalist economy portray what Marx calls the “wage form”, with its exchange of equivalents, as the whole (rather than a part) of the story about the relation between capital and labour, thereby ignoring the exploitation which occurs in the sphere of production. Indeed, the notion of the “falsity” of ideology needs to be expanded beyond the content of the “ideas” in question, to include cases where their origins are in some way contaminated (Geuss 1981: 19–22). Perhaps the only reason I believe something to be the case is that the belief in question has a consoling effect on me. Arguably such a belief is held ideologically, even if it happens to be true. Nevertheless paradigmatic examples of ideology have a false content. For example, ideology often portrays institutions, policies, and decisions which are in the interests of the economically dominant class, as being in the interests of the society as a whole (MECW 5: 60); and ideology often portrays social and political arrangements which are contingent, or historical, or artificial, as being necessary, or universal, or natural (MECW 35: 605).