I've long thought that a guaranteed income is an idea worth trying. But it did occur to me recently that such an amount would let you live like a king in many developing countries. Is there anything in the proposal to stop people from simply moving abroad?
More generally, how should a well designed universal income proposal treat travel/living abroad? If you cut off payments for those that are no longer residents, you suddenly provide a huge disincentive for travel. If you keep them, you encourage mass emigration.