You absolutely do not need exponential growth for UBI in a world with heavy automation. UBI is needed in a world where a large percentage of jobs have been auto

You absolutely do not need exponential growth for UBI in a world with heavy automation. UBI is needed in a world where a large percentage of jobs have been automated, that implies everything in your supply chain is run by robots. When robots produce the goods, UBI is just a mechanism to distribute those goods evenly among society.