The number k has two special features: (1) If k or more contribute, each contributor is joining a scheme whose net effect is to benefit his own children. The children of each contributor will be benefited more than they would have been if no one had contributed. (2) If less than k contribute, any contributor’s children will be benefited less than they would have been if no one had contributed. (1) and (2) make k a plausible moral threshold above which each parent ought to contribute. We can claim (R2) In such cases, each ought to contribute if he believes that there will be at least k
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