This trend continued after the war, as much of the population began migrating into the suburbs, buying cars, and shopping at large new shopping centres with ample parking lots. Though UPS had continued to expand its retail store services throughout the 1930s and 1940s, by the early 1950s it was clear that contract service to retail stores was limited. Therefore, UPS managers began looking for new opportunities while the core business remained focussed on retail delivery.