The capabilities approach: freedom as a real opportunity
An accessible guide to the capabilities approach: how Sen and Nussbaum shift attention from equal resources to the real opportunities people have, and why institutions, measurement, and public reasoning still matter.
A person who uses a wheelchair and a person who does not may receive the same income, hold the same legal rights, and live under the same public policy. They can still have very different opportunities to move through a city, reach a workplace, or participate in public life. The capabilities approach begins with that gap between what people possess on paper and what they can actually do. 12
Working definition
The capabilities approach is a framework for judging well-being and justice by asking about people's real opportunities to achieve lives they have reason to value. It distinguishes between capabilities, the opportunities available to a person, and functionings, the doings and beings that person actually realizes. Being well-nourished, educated, mobile, or politically active can be a functioning. Having a genuine choice among those possibilities is a capability. 1
That distinction changes what counts as a fair comparison:
| What we measure | The question | Why it can mislead |
|---|---|---|
| Resources | How much income, property, or public provision does someone have? | Equal resources may produce unequal opportunities when people face different bodies, environments, or social barriers. 2 |
| Functionings | What has someone actually achieved? | A good outcome may have been forced, while a person may freely decline an option that remains open to them. 3 |
| Capabilities | What can someone really do or be, if they choose? | Opportunities are harder to observe and compare than achieved outcomes, and the relevant list is contested. 1 |
The approach therefore treats freedom as more than a formal right. A legal right to education is not yet the capability to learn if a school is inaccessible, transport is unavailable, or discrimination blocks entry. The important question is what the right makes possible in a person's actual circumstances. 1
Sen's move from goods to lives
Amartya Sen developed the approach through a critique of the limited information used by influential economic and philosophical theories. Utilitarianism evaluates states of affairs through utility, often understood as happiness or preference satisfaction. Resource-based theories, including Rawls's focus on primary goods, compare people's holdings. Sen argued that both approaches can miss what people are able to do with what they have, especially when bodies, needs, and social conditions differ. 14
His 1979 lecture "Equality of What?" uses disability to make the point. If a disabled person and an able-bodied person have the same goods, the disabled person may still have fewer opportunities because some resources must be spent on mobility or access. Sen's proposal was to compare basic capabilities, such as the ability to move, meet nutritional needs, obtain shelter, and participate in community life. He called this "basic capability equality," while stressing that it was a partial guide to equality, not a complete account of moral value. 2
The example is not limited to disability. Consider a city that gives every resident the same transit pass. The pass is a resource. Reliable buses, step-free stations, safe streets, affordable childcare, and freedom from harassment determine how far that resource can be converted into capabilities. The approach calls these conditions conversion factors: personal, social, political, and environmental features that shape what resources make possible. 1
This is why capabilities are not a disguised celebration of markets or private choice. Markets may be one means among others, but the framework evaluates institutions by the opportunities they create, restrict, or distribute. A formal entitlement matters only when people can use it without obstacles that the entitlement leaves untouched. 1
Sen and Nussbaum: openness versus a threshold
Sen kept the framework relatively open-ended. He argued that the capabilities people have reason to value should be selected through public reasoning rather than fixed in advance by a philosopher. This leaves room for democratic disagreement and cultural variation, but it also leaves difficult questions about which capabilities count, how they should be weighted, and how they can be compared. 13
Martha Nussbaum turned the same general insight into a more specified theory of justice. In Creating Capabilities, she argues that a decent political order must secure every citizen at least a threshold level of ten Central Capabilities: life; bodily health; bodily integrity; senses, imagination, and thought; emotions; practical reason; affiliation; relations with other species; play; and control over one's political and material environment. Her standard is tied to the idea of a life worthy of human dignity. 5
| Question | Sen's emphasis | Nussbaum's emphasis |
|---|---|---|
| Who identifies the relevant capabilities? | Public reasoning and democratic deliberation, without a final canonical list. 1 | A substantive list grounded in human dignity and used as a political standard. 5 |
| What does justice require? | Improve the information used to compare lives, while leaving the final theory open to argument. 2 | Bring everyone above a minimum threshold in each central area, rather than compensate for one severe deprivation with gains in another. 5 |
| What is the risk? | Openness can become under-specification: without a selection or weighting procedure, policy comparisons remain difficult. 1 | A fixed list makes the theory more usable, but raises questions about paternalism, cultural variation, and who has the authority to set the threshold. 1 |
The disagreement is not between freedom and government. It is about how a political community should decide which freedoms must be protected, and how firmly it should protect them. Sen gives democratic reasoning more work to do. Nussbaum gives constitutional and policy judgment a clearer floor. 15
The live debates
Choice versus achievement
A capability is an opportunity, not a required outcome. Two people may both be able to access health care, while only one uses it; measuring functionings alone would treat the result as an inequality, even though their opportunities were similar. The reverse problem also matters: people can report satisfaction or achieve a respectable outcome after adapting their preferences to severe constraint. A framework concerned with freedom must ask both what people achieved and which alternatives were genuinely available. 14
Measurement and selection
Capabilities are attractive because they widen the information used in judgments, but the extra information is difficult to gather. The UNDP Human Development Report Office notes that functionings are easier to observe and measure than the capability sets from which people choose. Its human-development work therefore uses observable dimensions without claiming that a single index captures every freedom. A 2016 UNDP paper argues for enlarging evaluation from a capability perspective rather than simply replacing the Human Development Index with one supposedly complete measure. 36
The measurement problem is political as well as technical. Choosing dimensions and weights decides what a society will count as deprivation, progress, or an acceptable trade-off. Sen's resistance to a fixed list protects space for public reasoning, but it does not remove the need for institutions to make decisions. Nussbaum's threshold makes exclusion easier to identify, but the threshold still requires interpretation and revision. 15
Institutions and shared conditions
The approach is often presented in individual terms, but individual opportunities depend on social arrangements. The UNDP's discussion identifies states, markets, families, communities, trade unions, social movements, political parties, and non-governmental organizations as institutions that can shape capability sets. Discriminatory norms can restrict employment, education, health, and security even when formal rights are equal. 3
This creates a productive pressure on the theory. If capabilities belong to individuals, how should the framework describe collective action, care relationships, or institutions that people can use only together? Contemporary capability scholars have developed applications in public health, disability, education, environmental ethics, climate justice, and human development, while continuing to debate the roles of social relations, collective capabilities, and political responsibility. 1
A practical reading frame
When evaluating a policy, institution, or political argument, ask four questions:
- What resources or formal rights are being offered, and what can people actually do or be with them? 1
- Which personal, social, or environmental conversion factors help or block the result? 1
- Is the policy judging a chosen outcome, or quietly treating one outcome as compulsory? 3
- Who decides which capabilities matter, who is missing from that decision, and what minimum threshold should no one fall below? 15
"Human development is a process of enlarging people's choices." 3
That sentence captures the approach's political demand. Do not stop at equal inputs, declared rights, or reported satisfaction. Ask whether institutions enlarge the set of lives people can genuinely choose, and whether the least advantaged can exercise those choices without needing to overcome barriers that public policy has left in place. 12
References
- 1The Capability Approach - Stanford Encyclopedia of Philosophy
plato.stanford.edu
- 2Equality of What? - Amartya Sen
ophi.org.uk
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