Full Idea
Lewis's basic account has a basic causal relation, counterfactual dependence, and the general causal relation is the ancestral of this basic one. ...This is motivated by counterfactual dependence failing to be general because of the pre-emption problem.
Gist of Idea
Lewis has basic causation, counterfactuals, and a general ancestral (thus handling pre-emption)
Source
report of David Lewis (Causation [1973]) by Alexander Bird - Causation and the Manifestation of Powers p.161
Book Reference
'The Metaphysics of Powers', ed/tr. Marmodoro,Anna [OUP 2013], p.161
A Reaction
It is so nice when you struggle for ages with a topic, and then some clever person summarises it clearly for you.
Related Idea
Idea 10032 'Ancestral' relations are derived by iterating back from a given relation [Frege, by George/Velleman]