Self interest is simply focusing on your own needs and desires, and it plays a surprising role in how we understand human actions and even how societies are organized.

Key idea: Philosophical ideas like ethical egoism and enlightened self interest explore whether acting in one's own best interest is morally right or beneficial in the long run.

When we talk about self interest, different areas of thought have explored it in unique ways. In philosophy, for example, some ideas suggest that acting in your own best interest is actually the right thing to do. This is called ethical egoism. It is not about being selfish in a mean way, but rather a belief that people should do what benefits them.

Then there is enlightened self interest. This idea suggests that when you help others, you are actually helping yourself in the long run. Think of it like this: if you are kind to your neighbors, they might be kind back to you, making your own life better. So, helping others is not purely selfless; it also serves your own interests. Other philosophies, like hedonism, focus on pleasure as the ultimate good, which is a form of self interest because pleasure is something we desire for ourselves.

“When you help others, you are actually helping yourself in the long run.”

Key idea: Legalism, an ancient Chinese philosophy, viewed self interest as the primary driver of all human behavior, advocating for strict laws and clear rewards and punishments to align individual interests with the state's needs.

Now, let us look at a very old idea from China called Legalism. This was a political philosophy that had a very clear and somewhat tough view of human nature. Legalists believed that self interest is the absolute core of what makes people tick. They thought that everyone, from the common person to the highest leader, would always act based on what benefits them personally.

Because of this, Legalists argued that you could not rely on people to be naturally good or trustworthy. Instead, they believed that a strong government needed clear, strict laws and rules, enforced with rewards and punishments. Their idea was that if you make it in a person's self interest to follow the rules (by rewarding good behavior and punishing bad), then society will be orderly. They did not trust systems based on personal trust or respect, because they believed even virtuous actions were secretly driven by a desire for a good reputation or other benefits.

Think of it like training a pet: you give a treat (reward) for sitting, and you might scold (punishment) for jumping on the furniture. The pet learns it is in its own best interest to follow your commands. Legalists applied this same logic to human society, believing that people could be guided towards actions that benefit the state if their personal interests were aligned with those actions through clear incentives.

“Legalists believed that everyone, from the common person to the highest leader, would always act based on what benefits them personally.”

Key idea: Psychological theories like psychological egoism propose that all human actions, even seemingly selfless ones, are ultimately driven by self interest, while narcissism represents an unhealthy, extreme form of self absorption.

In the world of psychology, self interest also takes center stage. One key idea is psychological egoism, which suggests that humans are always motivated by self interest, even if it does not seem that way on the surface. For example, if you donate to charity, a psychological egoist might argue that you are doing it because it makes you feel good, or because you want others to see you as a generous person, rather than purely out of selfless concern for others.

Another related concept is narcissism. This is an unhealthy form of self absorption where a person has an excessive focus on their own needs, desires, and importance, often at the expense of others. It is a disturbance in how they see themselves, leading to an extreme form of self interest that can be harmful.