Although the notion of an essentially contested concept may shed light on the logic of disputes over the proper application of some key political terms, it nevertheless plays no genuine role in explaining the intractability of these disputes. The notion of an essentially contested concept is defended against some influential criticisms, showing how it is possible for one conception of an essentially contested concept to be justifiably regarded as superior to other competing conceptions. Two possible answers are distinguished to the (...) question of why disputes over essentially contested concepts should be regarded as inevitable, but neither provides us with a plausible explanation for why they are so intractable. Disagreements over the proper use of key political concepts are better explained by features of moral and political discourse, such as the short reach of ?intellectual authority? and the fact that consensus is not one of its primary aims, in conjunction with empirical hypotheses from the social sciences, rather than by essential contestedness theses. (shrink)

Philosophers have often noted that science displays an uncommon degree of consensus on beliefs among its practitioners. Yet consensus in the sciences is not a goal in itself. I consider cases of consensus on beliefs as concrete events. Consensus on beliefs is neither a sufficient nor a necessary condition for presuming that these beliefs constitute knowledge. A concrete consensus on a set of beliefs by a group of people at a given historical period may be explained by different factors according (...) to various hypotheses. A particularly interesting hypothesis from an epistemic perspective is the knowledge hypothesis: shared knowledge explains a consensus on beliefs. If all the alternative hypotheses to the knowledge hypotheses are false or are not as good in explaining a concrete consensus on beliefs, the knowledge hypothesis is the best explanation of the consensus. If the knowledge hypothesis is best, a consensus becomes a plausible, though fallible, indicator of knowledge. I argue that if a consensus on beliefs is uncoerced, uniquely heterogeneous and large, the gap between the likelihood of the consensus given the knowledge hypothesis and its likelihoods given competing hypotheses tends to increase significantly. Consensus is a better indicator of knowledge than "success" or "human flourishing". (shrink)