1. You cannot build and sustain a polity on the idea of redistributing wealth to take advantage of differences in the marginal utility of money across varying wealth classes.
2. The ideas you can sustain a polity around often contradict the notion of socially arbitraging MU differences to try to boost total utility.
3. The MU argument, in isolation, is therefore rarely compelling. Furthermore its “naive” invocation is often a sign of underlying weakness in the policy case someone is trying to make. The proposed policy may simply be too at odds with otherwise useful social values.
4. This is related to why parties from “the traditional Left” so often lose elections, including in a relatively statist Europe.
5. That all said, sometimes we should in fact take advantage of MU differences in marginal increments of wealth and use them to drive policy.
6. Figuring out how to deal with this tension — ignoring MU differences, or pursuing them — is a central task of political philosophy.
7. The selective invocation of the differential MU argument — or the case against it — will make it difficult to improve your arguments over time; arguably it is a sign of intellectual superficiality.