I find a lost wallet containing the owner's address and a lot of cash. Shall I keep it or return it? Suppose I have the ‘liberty of indifference’: whatever I do, I could have done otherwise. Indeed, part of what is meant in saying I act freely is that either way what I do is up to me. And let's allow this liberty requires that my choice is not a logical consequence of the past and natural laws. If I return (...) the wallet, I could have kept it without violating a law of nature or changing the past. Let's call this ‘situation S’ . Suppose I return the wallet.Others are also in S: free people find lost wallets every day. Each of us can freely return the wallet we find. It doesn’t follow immediately that we can all return it, however. That each ticket holder can win the lottery doesn’t entail they can all win it. We need the additional premiss that no number of people freely returning the wallet prevents the remainder from freely returning it. In short: each of us in S can freely return the wallet. Further, no number of us doing so prevents the remainder from doing so. Therefore it's possible that we all freely do what I do.According to Modal Realism , other possible worlds are concrete realities and the people in them as real as you and me. Some of these people are in S. Each of them can freely return the wallet; none of them is prevented from exercising that ability by others doing so, including others in worlds causally isolated from theirs. For instance, our doings in the actual world no more limit their abilities than …. (shrink)

It is widely agreed that contraposition, strengthening the antecedent and hypothetical syllogism fail for subjunctive conditionals. The following putative counter-examples are frequently cited, respectively.

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