Aaron and Ed are roommates. After a big snowstorm, their driveway needs to be shoveled. Each person has to decide whether to take part in shoveling the driveway. At the end of the day, either the driveway will be shoveled (if one or both roommates take part in shoveling), or it will remain unshoveled (if neither roommate shovels). With happiness measured on a scale of 1 (very unhappy) to 10 (very happy), the possible outcomes are as follows: Aaron's Decision Shovel Don't shovel Avon's happiness = 6 Aaron's happiness = 10 Shovel Ed Ed's happiness = 6 Eds happiness - 1 Decision Auon's happiness = 4 Auon's happiness - 2 Don't shovel Ed's happiness = 7 Ede happiness - 3 In pursuing his own self-interest, Aaron will O shovel only if Ed refrains from shoveling. shovel only if Ed shovels. O refrain from shoveling whether or not Ed shovels. shovel whether or not Ed shovels