Two stores, Allfoods (A) and Barks&Sensor (B), are located on the two opposite ends of a straight road.The length of the road is 1 mi.The road is populated by a continuum of consumers (a unit mass) that are distributed uniformly along this road (alternatively, you may assume that there is a single consumer living on the road, but the location of the consumer is uniform random and is not observed by A and B). In order to buy from a store, each consumer has to travel to that store and back. The cost of a return trip is equal to the distance from consumer's home to the store in miles