Full Idea
The orthodox realist view has it that what makes an ascription a disposition ascription is not that it is equivalent to a conditional proposition but that it entails one.
Gist of Idea
Orthodoxy says dispositions entail conditionals (rather than being equivalent to them)
Source
Stephen Mumford (Dispositions [1998], 04.7)
Book Reference
Mumford,Stephen: 'Dispositions' [OUP 1998], p.83
A Reaction
Mumford says that Martin has shown that dispositions need not entail conditionals (when a 'fink' is operating, something which intervenes between disposition and outcome).