1.1 Goals 1.1.1 I have two main goals in this book. The first is to give an account of the moral significance of merely possible persons - persons who, relative to a particular 1 circumstance, or possible future or world, could but in fact never do exist. I call that account Variabilism. My second goal is to use Variabilism to begin to address the problem of abortion. 1.1.2 We ought to do the best we can for people. And we consider this obligation to extend to people who are, relative to a world, existing or future. But does it extend to merely possible people as well? And, if it does, then does it extend to making things better for them by way of bringing them into existence? If we say that surely it doesn't, does that then mean that our obligation to do the best we can for people does not, after all, extend to the merely possible - that the merely p- sible do not matter morally? But if the merely possible do not matter morally, then doesn't that mean that it would be permissible for us to bring them into miserable existences - and even obligatory to do just that - in the case where bringing the merely possible into miserable existences creates additional wellbeing for existing 1 References to merely possible persons and, later on, to persons who do exist - existing persons

Melinda A. Roberts and David T. Wasserman 1 Purpose of this Collection What are our obligations with respect to persons who have not yet, and may not ever, come into existence? Few of us believe that we can wrong those whom we leave out of existence altogether-that is, merely possible persons. We may think as well that the directive to be "fruitful, and multiply, and replenish the earth" 1 does not hold up to close scrutiny. How can it be wrong to decline to bring ever more people into existence? At the same time, we think we are clearly ob- gated to treat future persons-persons who don't yet but will exist-in accordance with certain stringent standards. Bringing a person into an existence that is truly awful-not worth having-can be wrong, and so can bringing a person into an existence that is worth having when we had the alternative of bringing that same person into an existence that is substantially better. We may think as well that our obligations with respect to future persons are triggered well before the point at which those persons commence their existence. We think it would be wrong, for example, to choose today to turn the Earth of the future into a miserable place even if the victims of that choice do not yet exist.

Melinda A. Roberts and David T. Wasserman 1 Purpose of this Collection What are our obligations with respect to persons who have not yet, and may not ever, come into existence? Few of us believe that we can wrong those whom we leave out of existence altogether-that is, merely possible persons. We may think as well that the directive to be "fruitful, and multiply, and replenish the earth" 1 does not hold up to close scrutiny. How can it be wrong to decline to bring ever more people into existence? At the same time, we think we are clearly ob- gated to treat future persons-persons who don't yet but will exist-in accordance with certain stringent standards. Bringing a person into an existence that is truly awful-not worth having-can be wrong, and so can bringing a person into an existence that is worth having when we had the alternative of bringing that same person into an existence that is substantially better. We may think as well that our obligations with respect to future persons are triggered well before the point at which those persons commence their existence. We think it would be wrong, for example, to choose today to turn the Earth of the future into a miserable place even if the victims of that choice do not yet exist.

1.1 Goals 1.1.1 I have two main goals in this book. The first is to give an account of the moral significance of merely possible persons - persons who, relative to a particular 1 circumstance, or possible future or world, could but in fact never do exist. I call that account Variabilism. My second goal is to use Variabilism to begin to address the problem of abortion. 1.1.2 We ought to do the best we can for people. And we consider this obligation to extend to people who are, relative to a world, existing or future. But does it extend to merely possible people as well? And, if it does, then does it extend to making things better for them by way of bringing them into existence? If we say that surely it doesn't, does that then mean that our obligation to do the best we can for people does not, after all, extend to the merely possible - that the merely p- sible do not matter morally? But if the merely possible do not matter morally, then doesn't that mean that it would be permissible for us to bring them into miserable existences - and even obligatory to do just that - in the case where bringing the merely possible into miserable existences creates additional wellbeing for existing 1 References to merely possible persons and, later on, to persons who do exist - existing persons