But is the purpose of a UBI or Negative Income Tax to spur people to find work? I think the benefit is it allows people to take more risk - so they can avoid t

But is the purpose of a UBI or Negative Income Tax to spur people to find work? I think the benefit is it allows people to take more risk - so they can avoid taking a bad job and getting stuck in a local minimum (like intelligent college graduates stuck making coffee or would-be entrepreneurs who cannot risk launching their side project) which then allows them to contribute more to society (both in taxes and other manners). Also given the expense of administering means-tested welfare programs it could be more efficient.