Egoism is a teleological theory of ethics that sets as its goal the benefit, pleasure, or greatest good of the oneself alone. It is contrasted with altruism, which is not strictly self-interested, but includes in its goal the interests of others as well. There are at least three different ways in which the theory of egoism can be presented:

This is the claim that humans by nature are motivated only by self-interest . Any act, no matter how altruistic it might seem, is actually motivated by some selfish desire of the agent (e.g., desire for reward, avoidance of guilt, personal happiness). This is a descriptive claim about human nature. Since the claim is universalall acts are motivated by self interestit could be proven false by a single counterexample.

It will be difficult to find an action that the psychological egoist will acknowledge as purely altruistic, however. There is almost always some benefit to ourselves in any action we choose. For example, if I helped my friend out of trouble, I may feel happy afterwards. But is that happiness the motive for my action or just a result of my action? The psychological egoist must demonstrate that the beneficial consequences of an action are actually the motivation of of all of our actions. (Why would it make me happy to see my friend out of trouble if I didnt already care about my friends best interest? Wouldnt that be altruism?)

This is the claim that individuals should always act in their own best interest. It is a normative claim. If ethical egoism is true, that appears to imply that psychological egoism is false: there would be no point to arguing that we ought to do what we must do by nature.

But if altruism is possible, why should it be avoided? Some writers suggest we all should focus our resources on satisfying our own interests, rather than those of others. Society will then be more efficient and this will better serve the interests of all. By referring to the interests of all, however, this approach reveals itself to be a version of utilitarianism, and not genuine egoism. It is merely a theory about how best to achieve the greatest good for the greatest number.

An alternative formulation of ethical egoism states that I ought always to act in my own self-interesteven if this conflicts with the values and interests of otherssimply because that is what I desire most. It is not clear how an altruist could find common ground to argue with such an individualistic ethical egoist, but it is also not clear why such an egoist would ever want to argue against the altruist: Since the individualistic egoist believes that whatever serves his own interests is (morally) right, he will want everyone else to be altruistic. Otherwise they would not serve the egoists own interests! It seems that anyone who truly believed in individualistic ethical egoism could not publicly promote the theory without such inconsistency. Indeed, the self-interest of the egoist is best served by publicly claiming to be an altruist and thereby keeping everyones good favor.

When working with certain economic or sociological models, we may frequently assume that people will act in such a way as to promote their own interests. This is not a normative claim and usually not even a descriptive claim. Instead it is a minimalist assumption used for certain calculations. If we assume only self-interest on the part of all agents, we can determine certain extreme-case (e.g., maximin) outcomes for the model. Implicit in this assumption, although not always stated, is the idea that altruistic behavior on the part of the agents, although not presupposed, would yield outcomes at least as good and probably better.

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Dr. Charles Kay Egoism