I'm surprised to [see] the strong utilitarian view described as the consensus. I don't know much about utilitarian optimal tax theory, but I also don't know of any public finance or policy people who are dying to revive the prescriptive insights of Jeremy Bentham and Francis Edgeworth. Is there a cult of utilitarian social planners out there waiting to propose taxes on inputs like height, intelligence and race?Well, no, to my knowledge no one is eager to tax height, intelligence, and race. But there is a prominent guy who lives at a nice home at 1600 Pennsylvania Avenue who wants to "spread the wealth around." The moral and political philosophy used to justify such income redistribution is most often a form of Utilitarianism. For example, the work on optimal tax theory by Emmanuel Saez, the most recent winner of the John Bates Clark award, is essentially Utilitarian in its approach.
The point of our paper is this: If you are going to take that philosophy seriously, you have to take all of the implications seriously. And one of those implications is the optimality of taxing height and other exogenous personal characteristics correlated with income-producing abilities.
A moral and political philosophy is not like a smorgasbord, where you get to pick and choose the offerings you like and leave the others behind without explanation. It is more like your mother telling you to clean everything on your plate. If you are a Utilitarian redistributionist, the height tax is like that awful tasting vegetable your mother served up because it is good for you. No matter how hard you might wish it wasn't there sitting on your plate, it just won't go away.
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