The debate over persistence is often cast as a disagreement between two rival theories—the perdurantist theory that objects persist through time by having different temporal parts at different times, and the endurantist theory that objects persist through time by being wholly present at different times. This way of framing the debate over persistence involves both an important insight and an important error. Unfortunately, the error is often embraced and the insight is often ignored. This paper aims to correct both of (...) these mistakes, and thus clarify the debate over persistence. (shrink)

David Lewis has long defended an analysis of counterfactuals in terms of comparative similarity of possible worlds. The purpose of this paper is to reevaluate Lewis’s response to one of the oldest and most familiar objections to this proposal, the future similarity objection.

David Lewis’s semantics for counterfactuals remains the standard view. Yet counter-examples have emerged, which suggest a need to invoke causal independence, and thus threaten conceptual circularity. I will review some of these counter-examples (§§1–2), illustrate how causal independence proves useful (§3), and suggest that any resulting circularity is unproblematic (§4).

I develop an account of counterfactual conditionals using “causal models”, and argue that this account is preferable to the currently standard account in terms of “similarity of possible worlds” due to David Lewis and Robert Stalnaker. I diagnose the attraction of counterfactual theories of causation, and argue that it is illusory.