Oh not this again. First of all, Friedman advocated a negative income tax as a replacement to the ad-hoc mess of redistributive taxes, grants and welfare programs that exist now. Add a UBI to food stamps, unemployment benefits, farm subsidies, Medicare, Medicaid, Social Security, and the problems only get worse.

Second, this doomsday scenario of 50 million people waking up one day to discover there isn't a single thing in the world they can do to feed themselves is such hyperbolic nonsense you might as well be asking how opponents of a UBI plan to deal with a meteor demolishing Texas. Economies change. Sometimes a profession becomes obsolete. The people involved in it go elsewhere and on the whole everyone gets richer. It may sound unpleasant but it's only the same thing mankind has done a thousand times over already with great success. Unless you're mad about the fact that you don't have to milk your own cows anymore. This supposed choice between killing, jailing, or subsidizing millions of people is a false dichotomy that would sound like a joke to me if so many weren't sincerely buying into it. The other and far more reasonable option is to let free human beings navigate a changing world by adapting in the way each of them sees fit. They do it all the time. They don't need some savior swooping in with armloads of other people's money.