This is a question about Zoos/Factories/Aquariums. City A and City B are next to each other. They both have an industrial zone within 6 tiles of each city. City A builds a factory. City A gets a production bonus. City B also gets a production bonus, being within 6 tiles of the factory. Do they get the exact same bonus or does City A get a larger bonus because it both owns that industrial zone and is within 6 tiles of the factory? Later, City B also builds a factory. City A receives no further benefit from the factory. Does City B, upon building it's own factory, get any production bonus at all? Or is it just 100% useless to build that factory? Thanks!