Key Ethical Theories

Why This Matters

When you encounter ethics questions on an exam, you're not just being asked to define theories. You're being tested on your ability to apply different moral frameworks to real-world dilemmas and explain why they lead to different conclusions. Understanding these theories means grasping the fundamental question each one answers: Should we focus on outcomes, duties, character, relationships, or something else entirely when determining right from wrong?

The theories in this guide represent centuries of philosophical debate about the foundations of morality. Each offers a distinct lens for evaluating actions, and exam questions frequently ask you to compare approaches or identify which theory best addresses a particular scenario. Don't just memorize names and definitions. Know what makes each theory unique, where they overlap, and where they fundamentally disagree.

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Consequence-Based Theories

These theories share a common premise: the morality of an action depends on what happens as a result. They look forward to outcomes rather than backward to intentions or rules.

Consequentialism

• Morality is determined solely by results. An action is right if it produces good outcomes, wrong if it produces bad ones.
• This is a broad umbrella category that includes utilitarianism but isn't limited to it. Some consequentialist theories weigh factors like rights, justice, or equality of outcomes alongside happiness.
• As a forward-looking framework, it requires predicting and evaluating the effects of choices on all affected parties. That prediction requirement is both its practical strength and a frequent source of criticism: you can't always know what consequences your action will produce.

Utilitarianism

• Greatest happiness principle: the right action is the one that maximizes overall well-being (or "utility") for the greatest number of people.
• The Bentham vs. Mill distinction comes up often. Bentham treated all pleasures as equal and measured them quantitatively (duration, intensity, certainty, etc.) through what he called the felicific calculus. Mill argued that some pleasures are qualitatively superior to others. Mill's famous line: "It is better to be Socrates dissatisfied than a fool satisfied."
• You should also know the difference between act utilitarianism and rule utilitarianism. Act utilitarianism evaluates each individual action by its consequences. Rule utilitarianism asks which general rules, if everyone followed them, would produce the most utility. Rule utilitarianism helps address some classic objections (like "could utilitarianism justify punishing an innocent person?") because a rule permitting that would produce bad outcomes overall.
• The calculative, cost-benefit approach makes utilitarianism useful for policy decisions (think public health resource allocation), but it runs into trouble when outcomes are uncertain or when maximizing total happiness seems to require violating an individual's rights.

Ethical Egoism

• Self-interest as moral guide: individuals ought to act in ways that maximize their own long-term benefit.
• Two forms to distinguish: personal egoism (I should pursue my interests) versus universal egoism (everyone should pursue their own interests). Universal egoism is the philosophically serious version, since personal egoism is hard to defend as a moral theory rather than just a preference.
• Don't confuse ethical egoism with psychological egoism, which is a descriptive claim that people always do act in their own self-interest. Psychological egoism says what is; ethical egoism says what ought to be. They're different claims, and accepting one doesn't require accepting the other.
• This theory has controversial implications for altruism and cooperation. Proponents argue that enlightened self-interest can still lead to generous behavior (helping others builds trust and social capital that benefits you later), but critics point out it can't explain genuinely selfless acts as morally required.

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Duty-Based Theories

Rather than asking "what will happen?", these theories ask "what am I obligated to do?" The rightness of an action comes from following moral rules or commands, regardless of outcomes.

Deontological Ethics (Kantian Ethics)

• The categorical imperative is the core test. Kant's most famous formulation (the universalizability formulation): act only according to principles you could rationally will to become universal laws for everyone. A second key formulation (the humanity formulation) says you must treat people always as ends in themselves, never merely as means to your own goals.
• Intention matters more than results. An action done from a sense of duty has moral worth even if it fails to achieve good outcomes. Conversely, doing the right thing for selfish reasons lacks full moral credit. Kant called this acting from duty versus merely acting in accordance with duty.
• Some actions are inherently wrong (lying, breaking promises) regardless of circumstances. This makes Kantian ethics absolutist in nature, which is both its strength (clear moral lines) and its most common criticism (what about lying to protect someone from a murderer?). Kant himself actually addressed this case and maintained that lying is always wrong, which many people find deeply counterintuitive.

Divine Command Theory

• God's will defines morality. Actions are right because God commands them, wrong because God forbids them. Morality, on this view, has no independent foundation apart from God.
• The Euthyphro dilemma is the classic challenge, originally from Plato: Is something good because God commands it, or does God command it because it's good? The first option makes morality arbitrary (God could command cruelty). The second implies a moral standard independent of God, undermining the theory. Both horns of the dilemma create problems, which is why this objection has persisted for over two thousand years.
• Its faith-based foundation ties ethics to religious belief, which raises questions about how non-believers can have moral knowledge and whether people of different faiths can share a common moral framework.

Natural Law Theory

• Moral truths are discoverable through reason. Ethical principles are embedded in human nature and the natural order, not dependent on revelation or cultural agreement.
• The Aristotle-to-Aquinas lineage is important here. Aristotle argued that everything has a natural purpose (telos), and Aquinas built on this by arguing that rational reflection reveals inherent human goods: life, knowledge, sociability, and reproduction, among others. Acting in accordance with these goods is moral; acting against them is not.
• Because these standards are universal and objective, they exist independent of culture or divine revelation and are accessible to anyone through careful reasoning. This is what separates natural law from divine command theory, even though Aquinas was a theologian. For Aquinas, you don't need scripture to know basic moral truths; reason alone can get you there.

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Character-Based Theories

These approaches shift focus from what should I do? to what kind of person should I be? Moral development here is about cultivating the right traits over time, not following a decision procedure.

Virtue Ethics

• Character over rules. Moral excellence comes from developing virtues like courage, temperance, justice, and practical wisdom (phronesis).
• The Aristotelian foundation emphasizes that virtues are habits formed through practice, not innate gifts. You become courageous by doing courageous things. The goal is eudaimonia, often translated as human flourishing or living well, which is richer than mere happiness. Eudaimonia is about living a complete, well-functioning human life, not just feeling good.
• A key concept is the doctrine of the mean: each virtue is a balance between two extremes (vices). Courage, for example, is the mean between cowardice (too little) and recklessness (too much). The mean isn't a mathematical midpoint; it's the appropriate response given the situation.
• Virtue ethics relies on context-sensitive judgments. The virtuous person uses practical wisdom to discern the right action in each unique situation, rather than mechanically applying a rule. This flexibility is appealing, but critics argue it makes the theory vague: how do you know what a virtuous person would do?

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Relationship and Agreement-Based Theories

These theories ground morality in human connections, either formal agreements that create society or the caring relationships that sustain it.

Social Contract Theory

• Morality emerges from agreement. Individuals consent (explicitly or implicitly) to rules that enable cooperative social life. Without such agreement, there's no basis for moral obligation.
• Hobbes, Locke, and Rousseau differ significantly, and exams often test these distinctions. Hobbes saw the contract as an escape from a brutal "state of nature" where life is "solitary, poor, nasty, brutish, and short," and he favored a strong sovereign to keep order. Locke emphasized protecting pre-existing natural rights (life, liberty, property) and argued that people could overthrow a government that violated those rights. Rousseau focused on the general will and argued that society itself corrupts natural human goodness.
• John Rawls is a modern figure worth knowing. His thought experiment, the veil of ignorance, asks you to design society's rules without knowing what position you'd occupy in that society. Rawls argued this would lead rational people to choose principles that protect the worst-off members, since you might end up being one of them.
• Legitimacy of authority is central to all versions. Governments and laws are justified only if they reflect the consent of the governed. This makes social contract theory foundational to democratic political philosophy.

Care Ethics

• Relationships are morally primary. Ethical decisions should prioritize empathy, responsiveness, and maintaining connections over abstract principles applied from a distance.
• Care ethics has feminist origins in Carol Gilligan's work. Gilligan critiqued Lawrence Kohlberg's influential theory of moral development, arguing it was built on male-centered assumptions that privileged justice and abstract reasoning over care and relational thinking. Gilligan showed that many women reasoned morally through a "care orientation" that Kohlberg's framework undervalued. Nel Noddings further developed care ethics as a systematic ethical theory centered on the caring relation between persons.
• Context and particularity matter. Care ethics rejects the idea that good ethics means applying universal rules impartially to everyone. Your obligations to your child, your friend, or your aging parent are different from your obligations to a stranger, and that difference is morally significant, not a bias to overcome.

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Meta-Ethical Perspectives

These theories step back to ask: What is the nature of morality itself? Rather than prescribing actions, they examine the foundations of ethical claims. The theories above are all normative (they tell you what you should do). Meta-ethics asks a prior question: what does it even mean to say something is "right" or "wrong"?

Moral Relativism

• No universal moral truths. Ethical standards vary across cultures, historical periods, and social contexts, and there is no neutral standpoint from which to judge one set of standards as objectively correct.
• The descriptive vs. normative distinction is critical. Descriptive relativism simply observes that moral beliefs differ across cultures (this is an empirical fact almost everyone accepts). Normative relativism goes further and concludes that no culture's values are objectively superior to another's. The jump from descriptive to normative is where the real philosophical debate lives. Just because people disagree about morality doesn't automatically mean no one is right.
• Tolerance implications cut both ways. Relativism supports cultural humility and caution about imposing your values on others. But it struggles to condemn practices like oppression or genocide, since doing so seems to require the very cross-cultural moral standards relativism denies. There's also a self-referential problem: if relativism claims "you shouldn't impose your values on others," that itself looks like a universal moral claim.

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Quick Reference Table

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Self-Check Questions

1. Which two theories both emphasize consequences but disagree about whose well-being matters most? Explain the key difference.

2. A hospital has one dose of medicine and must choose between saving one famous scientist or five unknown patients. Which theory would most clearly support saving the five, and which might challenge that conclusion? Why?

3. Compare and contrast how Kantian Ethics and Virtue Ethics would evaluate someone who lies to protect a friend. What does each theory prioritize?

4. If an FRQ asks you to defend universal human rights against a moral relativist critique, which theory provides your strongest counterargument? Explain your reasoning.

5. Both Social Contract Theory and Care Ethics reject purely individualistic approaches to morality. How do their visions of human relationships differ, and what does each emphasize as the basis for ethical obligation?

6. Explain the Euthyphro dilemma in your own words. Why does it pose a problem for Divine Command Theory regardless of which horn you choose?