Full Idea
It seems that every property must be a causal power, since every property must be causally potent (as a necessary condition of its very existence).
Gist of Idea
All properties must be causal powers (since they wouldn't exist otherwise)
Source
Stephen Mumford (Dispositions [1998], 04.7)
Book Reference
Mumford,Stephen: 'Dispositions' [OUP 1998], p.84
A Reaction
Mumford cautiously endorses this idea, which seems to rest on the thesis that 'to exist is to have causal powers'. I think I am even keener on it than Mumford is. Powers and properties need to be disentangled, however.
Related Idea
Idea 3534 To be is to have causal powers [Alexander,S]