Consider a region with 2 export products (saxophones and soccer balls) and 2 local goods (haircuts and music concerts). The production of each export good is subject to localization economies, so each city specializes in one export good. According to the urban economist Grace Slick ibis my two assumptions (one for export products and one for local goods) are correct, all the cities in the regions will be the same size?. Assume that Slickers logic is correct. List her assumptions and explain why together they imply the regions cities will have the same size.