A bare standard of living in the administrative unit in question, in this case the USA. One of the reasons people move to cities is to find work - with BI they

A bare standard of living in the administrative unit in question, in this case the USA. One of the reasons people move to cities is to find work - with BI they wouldn't need to do that, so they wouldn't need to move to cities (and could move out if they were already there, without risking penury). BI increases market freedom, allowing society to utilise all available resources (such as land), without the positive feedbacks inherent in a system where a significant fraction of market participants cannot make free choices.