An interesting exercise by a smart economist, though like all such exercises one must pay attention to the details and be judiciously skeptical.
Summing up the exercise, I’d say that a universal basic income of the type I’ve sketched out here is economically feasible, but not, in the current environment, politically sustainable. However, while economic feasibility is largely a matter of arithmetic, and therefore resistant to change, political sustainability is more mutable, and depends critically on the distributional questions I’ve elided so far. A shift of 10 per cent of national income away from working households might seem inconceivable, but of course that’s precisely what’s happened in the US over the last twenty or thirty years, except that the beneficiaries have not been the poor but the top 1 per cent. So, if that money were clawed back by the state, it could fund a UBI at no additional cost to the 99 per cent.