Martha Nussbaum
Martha Nussbaum is the American philosopher whose collaboration with Amartya Sen produced the most developed version of the capability approach. Born in 1947, educated at NYU and Harvard, she has held positions at Brown, Oxford, and the University of Chicago, where she is currently the Ernst Freund Distinguished Service Professor of Law and Ethics. Her development of the capability framework differs from Sen's in one crucial respect: she specifies a list of central capabilities that any just society must secure for its members, whereas Sen deliberately left the selection open to democratic deliberation. The difference is philosophically significant and operationally consequential — Nussbaum's specification makes the framework more actionable but also more contested.
In the AI Story
Nussbaum's ten central capabilities are: life; bodily health; bodily integrity; senses, imagination, and thought; emotions; practical reason; affiliation; other species; play; and control over one's environment. Each capability is specified in enough detail to permit policy application while retaining sufficient generality to apply across cultural contexts. The list draws on Aristotelian ethics, Kantian moral philosophy, and extensive empirical engagement with development contexts, particularly the conditions of women in South Asia and Sub-Saharan Africa.
The philosophical divergence from Sen turns on the proper role of the philosopher in capability theory. Sen argues that specifying a definitive list of capabilities is a paternalist move that preempts democratic deliberation about which capabilities matter most in a given context. Nussbaum argues that without a specification, the framework is operationally underdetermined — organizations and governments need to know which capabilities to secure, and philosophical reticence leaves the specification to be made by those with the most power rather than by principled reasoning. Both positions have merit; the disagreement is productive rather than reducible.
Applied to AI, Nussbaum's specification provides more immediate actionability. An AI system can be evaluated against the ten central capabilities: does it support or undermine life, bodily health, bodily integrity, cognitive capabilities, emotional capacities, practical reason, affiliation, respect for other species, play, and control over one's environment? Sen's openness produces a more abstract evaluative orientation that requires democratic specification before application. For operational policy, Nussbaum's list is often more useful; for ongoing democratic legitimacy, Sen's openness retains important advantages.
Nussbaum's work has also extended the capability framework in directions Sen left undeveloped, particularly around emotions (her Upheavals of Thought argues for the cognitive content of emotions) and non-human animals (her framework explicitly extends capabilities-based ethics to animal welfare). These extensions have implications for AI ethics: emotions are part of human capability sets, and AI systems that shape emotional life are intervening in capabilities that the framework treats as central.
Origin
Nussbaum began collaborating with Sen in the 1980s at the World Institute for Development Economics Research. Her major capability works include Women and Human Development (2000), Frontiers of Justice (2006), and Creating Capabilities (2011).
Key Ideas
Ten central capabilities. A specific list of capabilities that any just society must secure.
Specification over openness. Philosophical disagreement with Sen about the role of the theorist in capability selection.
Aristotelian foundation. Her framework draws more explicitly on Aristotle's concept of human flourishing than Sen's does.
Extension to animals and emotions. Her version of the framework explicitly addresses domains Sen left peripheral.
Debates & Critiques
The Sen-Nussbaum disagreement over specification versus openness is the most productive ongoing debate within capability theory. Each position responds to genuine concerns about the other — paternalism and underdetermination respectively — and the debate has not been resolved.
Appears in the Orange Pill Cycle
Further reading
- Martha Nussbaum, Women and Human Development: The Capabilities Approach (Cambridge University Press, 2000)
- Martha Nussbaum, Creating Capabilities: The Human Development Approach (Harvard University Press, 2011)
- Martha Nussbaum, Frontiers of Justice (Harvard University Press, 2006)