The Minimax Principle is a part of social exchange theory that states that people will join and remain in a group that can provide them with the maximum amount of valuable rewards while at the same time, ensuring the minimum amount of costs to themselves. However, this does not necessarily mean that a person will join a group simply because the reward/cost ratio seems attractive. According to Howard Kelley and John Thibaut, a group may be attractive to us in terms of costs and benefits, but that attractiveness alone does not determine whether or not we will join the group. Instead, our decision is based on two factors: our comparison level, and our comparison level for alternatives.