  I propose the purpose our concept of actual causation serves is minimizing
various cost in intervention practice. Actual causation has three features:
nonredundant sufficiency, continuity and abnormality; these features correspond
to the minimization of exploitative cost, exploratory cost and risk cost in
intervention practice. Incorporating these three features, a definition of
actual causation is given. I test the definition in 66 causal cases from actual
causation literature and show that this definition's application fit intuition
better than some other causal modelling based definitions.
