"We should replace the ragbag of specific welfare programs with a single comprehensive program of income supplements in cash [which] would provide an assured minimum to all persons in need, regardless of the reasons for their need, while doing as little harm as possible to their character, their independence, or their incentives to better their own conditions. ... A negative income tax provides comprehensive reform which would do more efficiently and humanely what our present welfare system does so inefficiently and inhumanely."