The nonidentity problem is the issue of how to justify the belief that it is wrong to bring a person into existence if they would have a flawed life, though still worth living, instead of bringing another, nonidentical person into existence who would have a better life. To have an impaired life that is worth living seems to be a good existence, at least for the person in question. The nonidentity problem was made known mostly by Derek Parfit. The problem draws attention to three intuitions that seemingly cannot all be correct. How we respond to this predicament and which intuitions a solution depends on have severe implications primarily in population ethics but it will also affect other areas, to mention a few; genetic engineering, if and ...