Abstract
Ned Hall has argued and many others have concurred that we have two related concepts of causation, roughly one of causation as "production" and one of causation as "dependence". If the two-concept thesis is correct, there is apparently a pervasive ambiguity to causal discourse in everyday life and in science. I will propose a view of the structure of causal reality that does justice to the most important insights of the two-concept view within an essentially unified metaphysical framework. At bottom there is a single causal "stuff", but there are two levels of discourse about this stuff, one more concrete and the other more abstract.
