How does cause depend on its effect?

This philosophical treatment of Nagarjuna by Westerhoff talks about how a cause depends on its effect. I think that this point is a stumbling block for me but in my philosophical interpretations of Buddhism *and* of life and death per se. He says: > There are three different ways in which we can make sense of > Nāgārjuna's assertion that the cause depends existentially on the > effect. And then proceeds to argue about them (which I cannot make complete sense of). Is the idea that a conditioned cause must be conditioned by its effect, in the sense of having it as a part?