The supreme court, of the corporate United states, decides New State Ice v. Liebmann, licensing may not be used by established businesses to prevent competition.  In a dissenting opinion, associate justice Louis D. Brandeis writes,

       It is one of the happy incidents of the federal system that a single courageous state may, if its citizens choose, serve as a laboratory; and try novel social and economic experiments without risk to the rest of the country.

       NOTE: Although Brandeis uses the word “country” here, the editors believe that he meant to use the word “Union,” which is a union of sovereign States under a federal system, with a central government whose powers are strictly limited by a respected Constitution; as opposed to “nation,” in which a central government, with almost limitless power, treats its constituent states as mere enclaves, provinces, or sub-divisions of its greater self.

       [added 7/2/2022] Thanks to Jim Lorenz, Chuck McGlawn and Bill Holmes for this entry.