Earlier quoted context omitted.
> Labor income is very important at the top end. The work a CEO performs in her superintendence of a large company generates what's economically labor income, even when paid as stock grants, options or the like. Basically all professional income (including that of devs) is labor income, not capital income. If the CEO has a significant voting power in his company, then it's capital income even if the said income is “a…
The optimality results are drawn from modeling assumptions that happen to be fairly general, not from any specific political views. For instance, much of the real-world political advocacy of UBI or cash transfers towards low-income folks is downstream from arguments about the predicted efficacy of this as a kind of redistribution; the arguments are not themselves politically motivated. The argument for taxing pure re…
The idea that someone rich would “work less and thus produce less value to the society if their marginal tax rate was non-zero” isn't “fairly general” it's straight Randian and it's not how the world works. Same for the idea that individual income reflect the value they create to society.
The idea that you ought not to tax capital is also politically motivated.
Anything can be said to be “optimal” if you pick the hypothesis accordingly, and that's exactly what's being done here… It may work on paper for a world populated by a spherical John Galt in vacuum, but it tells you nothing about the real world.