General triviality for counterfactuals

Abstract On an influential line of thinking tracing back to Ramsey, conditionals are closely linked the attitude supposition. When applied counterfactuals, this view suggests a subjunctive version so-called Ramsey test: probability counterfactual If A, would B ought be equivalent B, under supposition that A. I present collapse result for any endorses test. Starting from plausible assumptions, shows one’s rational credence in would-counterfactual and corresponding might-counterfactual have identical.