culture. Assumptions Social exchange theory is not one theory but a frame of reference within which many theories can speak to another, whether in argument or mutual support. All these theories are built upon several assumptions about human nature and the nature of relationships. Thibaut and Kelley have based their theory on two conceptualizations: one that focuses on the nature of individuals and one that describes the relationships between two people. Thus, the assumptions they make also fall into these categories. The assumptions that social exchange theory makes about human nature include the following: Humans seek rewards and avoid punishments. Humans are rational beings. The standards that humans use to evaluate costs and rewards vary over time and from person to person. The assumptions social exchange theory makes about the nature of relationships include the following: Relationships are interdependent. Relational life is a process. The prisoner's dilemma is a widely used example in game theory that attempts to illustrate why or how two individuals may not cooperate with each other, even if it is in their best interest to do so. It demonstrates that while cooperation would give the best outcome, people might nevertheless act selfishly. All relationships involve exchanges although the balance of this exchange is not always equal. We cannot achieve our goals alone so as humans sometimes we have to become actors. In the world today we see actors as unemotional people but that is not the case once we reach our goals in the end. Comparison levels Social exchange includes "both a notion of a relationship, and some notion of a shared obligation in which both parties perceive responsibilities to each other". John Thibaut and Harold Kelley proposed two comparison standards to differentiate between relationship satisfaction and relationship stability. This evaluation rests on two types of comparisons: Comparison Level and Comparison Level for Alternative. According to Thibaut and Kelley, the Comparison Level (CL) is a standard representing what people feel they should receive in the way of rewards and costs from a particular relationship. An individual's comparison level can be considered the standard by which an outcome seems to satisfy the individual. The Comparison Level for Alternative (CLalt) refers to "the lowest level of relational rewards a person is willing to accept given available rewards from alternative relationships or being alone". In other words, when using this evaluation tool, an individual will consider other alternative payoffs