 One way to make [Yablo’s] conjecture more plausible is to put the point in terms of the causal powers of the properties involved. […] the reason why “determinables and their determinates are not causal rivals” is because it is plausible, in the case of determinables and determinates, that each causal power of the determinable is identical to a causal power of its determinate. [Moreover, and for example,] the property of being scarlet, which is a determinate of the property of being red, evidently has more causal powers than the property of being red. (1999: 47)