A profound and thought-provoking question!

Social exchange theory is a fundamental concept in sociology and psychology that suggests people engage in social interactions and relationships based on the expectation of receiving rewards or benefits in return.

There are several reasons why people practice social exchange theory:

1. *Evolutionary roots*: Humans have evolved to prioritize self-preservation and survival. In ancestral times, reciprocal exchanges helped ensure mutual support and cooperation, increasing chances of survival.

2. *Cognitive biases*: Humans are wired with cognitive biases, such as the norm of reciprocity, which leads people to feel obligated to return favors or kindness.

3. *Social norms*: Societal norms and expectations often encourage reciprocal behavior, such as gift-giving or volunteering, to maintain social harmony and reputation.

4. *Emotional needs*: Humans have emotional needs, like feeling valued, appreciated, or loved. Social exchange theory helps fulfill these needs through reciprocal interactions.

5. *Power dynamics*: Social exchange theory can be used to exert influence, gain power, or achieve social status.

Regarding your question about humanity being “possessed with themselves,” it’s a complex issue.

In today’s society, many factors contribute to people’s focus on themselves:

1. *Individualism*: Modern societies often emphasize individualism, encouraging people to prioritize their own needs and goals.

2. *Social media*: Social media platforms can foster self-centeredness, as people curate their online personas and seek validation through likes and followers.

3. *Capitalism*: The capitalist system can promote self-interest, as individuals compete for resources, wealth, and success.

4. *Mental health*: Growing concerns about mental health, such as anxiety and depression, can lead people to focus on their own well-being and self-care.

However, it’s essential to recognize that humanity is not solely defined by self-interest.

Many people still engage in altruistic behaviors, such as volunteering, donating to charities, or simply helping others in need.

Ultimately, humanity is complex, and individuals exhibit a range of behaviors driven by various motivations.