theory views the actor as dealing not with another actor but with a market and environmental parameters, such as market price. Unlike economic exchange, the elements of social exchange are quite varied and cannot be reduced to a single quantitative exchange rate. According to Stafford, social exchanges involve a connection with another person; involve trust and not legal obligations; are more flexible; and rarely involve explicit bargaining. Cost and rewards Simple social exchange models assume that rewards and costs drive relationship decisions. Both parties in a social exchange take responsibility for one another and depend on each other. The elements of relational life include: Costs are the elements of relational life that have negative value to a person, such as the effort put into a relationship and the negatives of a partner. (Costs can be time, money, effort etc.) Rewards are the elements of a relationship that have positive value. (Rewards can be sense of acceptance, support, and companionship etc.) As with everything dealing with the social exchange theory, it has as its outcome satisfaction and dependence of relationships. The social-exchange perspective argues that people calculate the overall worth of a particular relationship by subtracting its costs from the rewards it provides. If worth is a positive number, it is a positive relationship. On the contrary, a negative number indicates a negative relationship. The worth of a relationship influences its outcome, or whether people will continue with a relationship or terminate it. Positive relationships are expected to endure, whereas negative relationships will probably terminate. In a mutually beneficial exchange, each party supplies the wants of the other party at lower cost to self than the value of the resources the other party provides. In such a model, mutual relationship satisfaction ensures relationship stability. Homans based his theory on behaviorism to conclude that people pursue rewards to minimize costs. The "satisfactory-ness" of the rewards that a party gains from an exchange relationship is judged relative to some standard, which may vary from party to party. Reciprocity Norm Summarized by Gouldner, the reciprocity norm states that a benefit should be returned and the one who gives the benefit should not be harmed. This is used to stabilize relationships and to identify egoism. This norm suggests independence in relationships and invite the individual to consider more than one's self-interest. The Social Penetration Theory Altman and D. Taylor introduced social penetration theory, which studies