The residents of cities A, B, C, D and E consume wi-fi routers, with consumption in each city is 150 routers (see the map below). The firm that produces routers must decide how to set-up production. It could set up five factories, dispersed across each city, with each factory producing 150 routers and supplying to its own local city market. In this case, the firm incurs no cost for shipping output. Alternatively, the firm could locate its factory at centrally located city C, and supply routers to the entire region. The single factory in city C must then produce 750 routers, 600 of which are shipped to the cities A, B, D and E for a shipping cost of $6 per router.