 If I believe that \(B\) if \(A\), i.e. (according to Supp) think \(A \amp B\) much more likely than \(A \amp{\sim}B\), this puts me in a position to make a conditional commitment to \(B\): to assert that \(B\), conditionally upon \(A\). If \(A\) is found to be true, my conditional assertion has the force of an assertion of \(B\). If \(A\) is false, there is no proposition that I asserted. I did, however, express my conditional belief — it is not as though I said nothing. Suppose I say “If you press that switch, there will be an explosion”, and my hearer takes me to have made a conditional assertion of the consequent, one which will have the force of an assertion of the consequent if she presses the button. Provided she takes me to be trustworthy and reliable, she thinks that if she presses the switch, the consequent is likely to be true. That is, she acquires a reason to think that if she presses it, there will be an explosion; and hence a reason not to press it.