In ethical philosophy, ethical egoism is the normative position that moral agents ought to act in their own self-interest. It differs from psychological egoism, which claims that people can only act in their self-interest. Ethical egoism also differs from rational egoism, which holds that it is rational to act in one's self-interest.Sanders, Steven M. "Is egoism morally defensible?" Philosophia. Springer Netherlands. Volume 18, Numbers 2–3 / July 1988 Ethical egoism holds, therefore, that actions whose consequences will benefit the doer are ethical.

Ethical egoism contrasts with ethical altruism, which holds that moral agents have an obligation to help others. Egoism and altruism both contrast with ethical utilitarianism, which holds that a moral agent should treat one's self (also known as the subject) with no higher regard than one has for others (as egoism does, by elevating self-interests and "the self" to a status not granted to others). But it also holds that one is not obligated to sacrifice one's own interests (as altruism does) to help others' interests, so long as one's own interests (i.e., one's own desires or well-being) are substantially equivalent to the others' interests and well-being, but they have the choice to do so. Egoism, utilitarianism, and altruism are all forms of consequentialism, but egoism and altruism contrast with utilitarianism, in that egoism and altruism are both agent-focused forms of consequentialism (i.e., subject-focused or subjective). However, utilitarianism is held to be agent-neutral (i.e., objective and impartial): it does not treat the subject's (i.e., the self's, i.e., the moral "agent's") own interests as being more or less important than the interests, desires, or well-being of others.

Ethical egoism does not, however, require moral agents to harm the interests and well-being of others when making moral deliberation; e.g., what is in an agent's self-interest may be incidentally detrimental, beneficial, or neutral in its effect on others. Individualism allows for others' interest and well-being to be disregarded or not, as long as what is chosen is efficacious in satisfying the self-interest of the agent. Nor does ethical egoism necessarily entail that, in pursuing self-interest, one ought always to do what one wants to do; e.g., in the long term, the fulfillment of short-term desires may prove detrimental to the self. Fleeting pleasure, then, takes a back seat to protracted eudaimonia. In the words of James Rachels, "Ethical egoism ... endorses selfishness, but it doesn't endorse foolishness."Rachels 2008, p. 534.

Ethical egoism is often used as the philosophical basis for support of right-libertarianism and individualist anarchism. These are political positions based partly on a belief that individuals should not coercively prevent others from exercising freedom of action.

Forms Ethical egoism can be divided into three categories: individual, personal, and universal. An individual ethical egoist would hold that all people should do whatever benefits "my" (the individual's) self-interest; a personal ethical egoist would hold that they should act in their self-interest, but would make no claims about what anyone else should do; a universal ethical egoist would argue that everyone should act in their self-interest.Waller (2005), p. 81.Waller (2005), p. 83.

History Ethical egoism was introduced by the philosopher Henry Sidgwick in his book The Methods of Ethics, written in 1874. Sidgwick compared egoism to the philosophy of utilitarianism, writing that whereas utilitarianism sought to maximize overall pleasure, egoism focused only on maximizing individual pleasure.

Philosophers before Sidgwick have also retroactively been identified as ethical egoists. One ancient example is the philosophy of Yang Zhu (4th century BC), Yangism, who views wei wo, or "everything for myself", as the only virtue necessary for self-cultivation. Ancient Greek philosophers like Plato, Aristotle and the Stoics were exponents of virtue ethics, and "did not accept the formal principle that whatever the good is, we should seek only our own good, or prefer it to the good of others." However, the beliefs of the Cyrenaics have been referred to as a "form of egoistic hedonism", and while some refer to Epicurus' hedonism as a form of virtue ethics, others argue his ethics are more properly described as ethical egoism.

Justifications Philosopher James Rachels, in an essay that takes as its title the theory's name, outlines the three arguments most commonly touted in its favor:He notes that "the theory is asserted more often than it is argued for. Many of its supporters apparently think its truth is self-evident, so that arguments are not needed." (Rachels 2008, p. 534.) "The first argument," writes Rachels, "has several variations, each suggesting the same general point:That is, that regarding and pursuing the interests of others is a self-defeating policy. Rachels quotes Alexander Pope in support of this: "Thus God and nature formed the general frame/And bade self-love and social be the same." "Each of us is intimately familiar with our own individual wants and needs. Moreover, each of us is uniquely placed to pursue those wants and needs effectively. At the same time, we know the desires and needs of others only imperfectly, and we are not well situated to pursue them. Therefore, it is reasonable to believe that if we set out to be 'our brother's keeper,' we would often bungle the job and end up doing more mischief than good." To give charity to someone is to degrade them, implying as it does that they are reliant on such munificence and quite unable to look out for themselves. "That," reckons Rachels, "is why the recipients of 'charity' are so often resentful rather than appreciative."Rachels 2008, p. 534, where it is pointed out that, in the strictest egoistic terms, this is an inconsequential argument. Ethical egoism does not bother itself with how others receive charity, irrespective of how degraded it makes them feel. The same reasoning applies to the previous two bullets, which use self-interest as a means to the end of beneficence, rather than for its own purposes, as the theory would dictate. Altruism denies an individual's value and is therefore destructive both to society and its individual components, viewing life merely as a thing to be sacrificed. Philosopher Ayn Rand is quoted as writing that, "[i]f a man accepts the ethics of altruism, his first concern is not how to live his life but how to sacrifice it."Rachels 2008, p. 535, where this argument is attributed to Ayn Rand, "a writer little heeded by professional philosophers but who nevertheless was enormously popular on college campuses in the 1960s and 1970s". Moreover, "[t]he basic principle of altruism is that man has no right to exist for his own sake, that service to others is the only justification for his existence, and that self-sacrifice is his highest moral duty, virtue or value." Rather, she writes, "[t]he purpose of morality is to teach you, not to suffer and die, but to enjoy yourself and live."Rand, Ayn, "Faith and Force: Destroyers of the Modern World," Philosophy: Who Needs It, p. 74; Atlas Shrugged, 1957, Random House, p. 1014; "Faith and Force," p. 74. All of our commonly accepted moral duties, from doing no harm unto others to speaking always the truth to keeping promises, are rooted in the one fundamental principle of self-interest. It has been observed, however, that the very act of eating (especially, when there are others starving in the world) is such an act of self-interested discrimination. Ethical egoists such as Rand who readily acknowledge the (conditional) value of others to an individual, and who readily endorse empathy for others, have argued the exact reverse from Rachels, that it is altruism which discriminates: "If the sensation of eating a cake is a value, then why is it an immoral indulgence in your stomach, but a moral goal for you to achieve in the stomach of others?"Rand, Ayn, Atlas Shrugged, 1957, Random House. It is therefore altruism which is an arbitrary position, according to Rand.

Criticism It has been argued that extreme ethical egoism is self-defeating. Faced with a situation of limited resources, egoists would consume as much of the resource as they could, making the overall situation worse for everybody. Egoists may respond that if the situation becomes worse for everybody, that would include the egoist, so it is not, in fact, in their rational self-interest to take things to such extremes. Britannica However, the (unregulated) tragedy of the commons and the (one off) prisoner's dilemma are cases in which, on the one hand, it is rational for an individual to seek to take as much as possible even though that makes things worse for everybody, and on the other hand, those cases are not self-refuting since that behaviour remains rational even though it is ultimately self-defeating, i.e. self-defeating does not imply self-refuting. Egoists might respond that a tragedy of the commons, however, assumes some degree of public land. That is, a commons forbidding homesteading requires regulation. Thus, an argument against the tragedy of the commons, in this belief system, is fundamentally an argument for private property rights and the system that recognizes both property rights and rational self-interest—capitalism. More generally, egoists might say that an increasing respect for individual rights uniquely allows for increasing wealth creation and increasing usable resources despite a fixed amount of raw materials (e.g. the West pre-1776 versus post-1776, East versus West Germany, Hong Kong versus mainland China, North versus South Korea, etc.).

It is not clear how to apply a private ownership model to many examples of "commons", however. Examples include large fisheries, the atmosphere and the ocean. Environment Magazine Environmental Science for Dummies

Some perhaps decisive problems with ethical egoism have been pointed out.

One is that an ethical egoist would not want ethical egoism to be universalized: as it would be in the egoist's best self-interest if others acted altruistically towards them, they wouldn't want them to act egoistically; however, that is what they consider to be morally binding. Their moral principles would demand of others not to follow them, which can be considered self-defeating and leads to the question: "How can ethical egoism be considered morally binding if its advocates do not want it to be universally applied?"

Another objection (e.g. by James Rachels) states that the distinction ethical egoism makes between "yourself" and "the rest" – demanding to view the interests of "yourself" as more important – is arbitrary, as no justification for it can be offered; considering that the merits and desires of "the rest" are comparable to those of "yourself" while lacking a justifiable distinction, Rachels concludes that "the rest" should be given the same moral consideration as "yourself".

Derek Parfit argues against ethical egoism in the book Reasons and Persons. Parfit argues that ethical egoism is collectively self-defeating due to the prisoner's dilemma. Parfit also poses thought experiments such as the teletransportation paradox, which challenge the idea of an objective future self and a continuous personal identity.