Full Idea
Causal laws are summaries of what entities are capable and incapable of.
Gist of Idea
Causal laws are summaries of powers
Source
C.B. Martin (The Mind in Nature [2008], 02.8)
Book Reference
Martin,C.B.: 'The Mind in Nature' [OUP 2008], p.21
A Reaction
That's a pretty good formulation. Personally I favour a Humean analysis, perhaps along Lewis's lines, but on a basis of real powers. This remark of Martin's has got me rethinking.