Bloody hell. I'm alive.
The Reynolds story is much, much, better than Paying it forward, and begins to explore plausible human reactions to our massive good (?) fortune in existing at all. One thought - I have been lucky all my life, just to be alive at all, but according to this hypothesis, there are infinitely many future 'me's, and for most of them, the run of luck has come to an end. But each me which survives will look back, and feel that the luck has continued. By definition. For all the others, the carnage starts now.