This isn't really an "in theory." Welfare states are fundamentally incompatible with open borders until we live in a world where equivalent levels of welfare ar

This isn't really an "in theory." Welfare states are fundamentally incompatible with open borders until we live in a world where equivalent levels of welfare are available everywhere. The incentives just don't add up. On the other hand it could still work if the benefit is only available to Californians who have lived there for X years. Not sure about the legality of this though -- states can discriminate this way for in-state University tuition, but in Zobel v. Williams the Supreme Court ruled that Alaska couldn't pay out Permanent Fund dividends based on how long you had lived in Alaska (https://en.wikipedia.org/wiki/Alaska_Permanent_Fund https://en.wikipedia.org/wiki/Alaska_Permanent_Fund).