 There is far less consensus about another domain condition: whether exploitation is a structural feature of social systems, a property of discrete individual transactions, or both. Philosophers also disagree about more substantive features of exploitation, such as how we should understand the unfairness present in exploitations, about whether exploitation also requires something more than unfairness, such as morally problematic motives or attitudes on the part of the exploiter, and about what Alan Wertheimer (1996: 279) has called the ‘moral weight’ (exploitation’s permissibility or impermissibility) and ‘moral force’ of exploitation (whether third parties should intervene in exploitations).