Martha Nussbaum
1947 CE – Present · Contemporary Era
“Human dignity requires not just rights but real capabilities: the actual ability to live a flourishing life.”
Biography
Nussbaum is prolific and publicly engaged across an unusual range of fields. Her capabilities approach (developed with Amartya Sen) argues that justice requires ensuring that every person has the real ability, not just the formal right, to live a fully human life. Her work spans ancient philosophy, emotions, animal rights, feminism, education, and constitutional law.
Major Works
Key Arguments
Click “Philosophy 101” to read the full exploration of each argument.
The Capabilities Approach
Nussbaum argued that a just society cannot be measured by GDP, average utility, or even the formal guarantee of rights. The key point is whether people actually have the capability to function in certain central ways. She identified ten central human capabilities that any just society must secure for every citizen above a minimum threshold: life (being able to live a normal length); bodily health; bodily integrity (freedom of movement, freedom from assault); senses, imagination, and thought (including education); emotions (being able to love, grieve, feel justified anger); practical reason (being able to form and pursue a conception of the good); affiliation (social connection and dignity); other species (being able to live with concern for nature); play; and control over one's environment (political participation and property rights). A society that formally guarantees free speech but provides no education has not secured the capability of thought. A society that declares equality but permits conditions in which women cannot leave the house without male permission has not secured bodily integrity.
Why it matters: The capabilities approach, developed in collaboration with economist Amartya Sen, though Nussbaum gave it its specifically philosophical form, has been adopted by the United Nations as the theoretical framework for the Human Development Index and has influenced constitutional law in India, South Africa, and elsewhere. It provides a powerful alternative to both utilitarian welfare measurement and libertarian rights-based frameworks by insisting that formal rights without real capabilities are empty.
Emotions as Judgments (The Intelligence of Emotions)
In Upheavals of Thought (2001), Nussbaum argued against the ancient Stoic view that emotions are irrational disturbances to be suppressed and against the modern view that they are mere bodily sensations. Emotions, she contended, are a form of evaluative judgment: to grieve is to judge that someone irreplaceable has been lost; to fear is to judge that something important is threatened; to feel compassion is to judge that another person is suffering through no fault of their own. Emotions are intelligent responses to the world that reflect our deepest values and attachments. A person incapable of grief, fear, or compassion would not be more rational, they would be blind to what matters. This does not mean all emotions are correct (we can be mistaken in our emotional judgments) but it does mean that emotions are an essential source of moral knowledge, not an obstacle to it.
Why it matters: Nussbaum's cognitive theory of emotions challenged both the Stoic-rationalist tradition and the Humean-sentimentalist tradition in ethics. Her work influenced moral psychology, the philosophy of law (she argued that emotions like compassion and disgust play legitimate and illegitimate roles in legal reasoning), and the growing interdisciplinary study of emotion in cognitive science, neuroscience, and psychology.
The Fragility of Goodness
In her first major work, Nussbaum examined a question that ancient Greek philosophy and tragedy both confronted: can a good person be harmed by bad luck? Plato and the Stoics said no, true virtue is invulnerable, and the truly good person cannot be harmed by external misfortune. Aristotle and the tragedians said yes, a good life requires not just virtue but also external goods (health, friendship, political freedom, a measure of material resources) that can be destroyed by forces beyond our control. Nussbaum argued that Aristotle and the tragedians were right, and that Plato's attempt to make goodness invulnerable came at an unacceptable price: it required denying the value of the very attachments, to particular people, to projects, to one's community, that make a human life rich and meaningful. Vulnerability is not a defect of the good life; it is a necessary condition of it.
Why it matters: The Fragility of Goodness (1986) revived ancient Greek ethical thought as a living resource for contemporary philosophy. Nussbaum argued that the ancient debate between Plato and Aristotle about luck and virtue is not a historical curiosity but a deep and unresolved question about the human condition. The book influenced the revival of virtue ethics, the philosophy of literature, and feminist philosophy.
Lasting Influence
The capabilities approach reshaped development economics, human rights, and constitutional law worldwide. The Nozickian objection -- that a state-mandated list of ten things every person must be capable of doing involves substantial positive obligations that require justification the framework does not provide -- remains the strongest counterargument.
Your Reading Path
The Companion Guide
Seven eras of philosophy in one volume — reading lists, key terms, journal prompts · $19.99