Imagine two people who earn exactly the same salary. One is healthy and can get anywhere by bus or subway, while the other uses a wheelchair and is turned away time and again in front of buildings without ramps or stations with nothing but stairs. They may hold the same amount of money, but the lives they lead are anything but the same. The perspective that focuses on this difference is the "Capability Approach."
Put simply, the capability approach means "a perspective that asks not what a person has, but what they can actually do and become with it." It was first proposed by the economist and philosopher Amartya Sen, developed further by the philosopher Martha Nussbaum, and has become an important framework today for looking at poverty, welfare and development.
In this article, we will look in turn at the basic concepts of the capability approach, why the same resources lead to different outcomes, examples of how it has shaped policies and indicators, and its significance and limits in the field of social welfare.
Key Concepts and Uses of the Capability Approach
What is the capability approach?
In his 1979 lecture "Equality of What?", Sen questioned the ways welfare had been measured until then. If you count only income or the amount of goods, the different circumstances of each person are hidden; if you measure only satisfaction or happiness, the hardship of people who have lowered their expectations after long deprivation does not come to light.
So Sen turned his attention to what people actually manage to do and the states in which they live. Two key terms explain this.
- Functionings: the actions and states a person has actually achieved, such as eating well, being healthy, reading and working.
- Capabilities: the combinations of functionings a person could achieve if they chose to, in other words the real freedoms and opportunities a person enjoys.
An example Sen gave shows this difference well. A person who is fasting and a person who is starving display the same functioning, in that neither is eating. But the person fasting has chosen not to eat even though they could, while the starving person never had that option in the first place. The capability approach places great weight on exactly this difference in the freedom to choose.
Same resources, different lives: conversion factors
Even if everyone is handed the same bicycle, not everyone ends up equally free to get around. That is because the ability to turn resources into actual functionings differs from person to person and from one environment to another. The capability approach calls these conversion factors and commonly divides them into three kinds.
(1) Personal conversion factors
These are conditions within the person, such as physical health, disability, age and acquired skills. For someone who has never learned to ride or who has injured a leg, a bicycle is of little help.
(2) Social conversion factors
These are conditions created by society, such as institutions, customs, discrimination and norms tied to gender or class. In a society that frowns on women riding bicycles, the same bicycle becomes less useful to some people.
(3) Environmental conversion factors
These are the physical conditions that surround a person, such as climate, terrain, roads and transport facilities. The freedom a bicycle offers is very different in a city with a dense network of bike lanes and in one designed around cars.
These three factors show that the same support can be ample for some and woefully short for others. That is why the capability approach does not stop at dividing things equally; it demands that we examine, all the way through, what each person has actually become able to do.
How the capability approach shaped policies and indicators
The capability approach did not remain a theory; it led to indicators for comparing lives across countries around the world. It grew out of the awareness that yardsticks looking only at the flow of money, such as gross domestic product, cannot fully capture people's actual lives.
- Human Development Index: first published in 1990 by the United Nations Development Programme, drawing on the ideas of Mahbub ul Haq, Sen and others, this index compares the quality of life in each country by combining not just income but also life expectancy and level of education.
- Multidimensional Poverty Index: used since 2010, this index examines poverty by counting the multiple deprivations people experience at the same time in health, education and living standards, rather than income.
- Central Human Capabilities: Nussbaum named ten capabilities as the minimum everyone should enjoy: life; bodily health; bodily integrity; senses, imagination and thought; emotions; practical reason; affiliation; other species; play; and control over one's environment.
Sen received the Nobel Prize in Economic Sciences in 1998, and his work greatly influenced a shift toward seeing economic growth not as a goal in itself but as a means of expanding people's freedom.
Significance and limits in social welfare practice
Social welfare is ultimately about helping people build the lives they want. The capability approach offers clear direction on how to measure that goal and where to focus efforts.
Implications for practice
- Human Diversity: it provides grounds for giving more support to those who can do less with the same resources, such as people with disabilities or those who take on caregiving.
- Removing Barriers: it reminds us that fixing conversion factors, such as ramps, transport and non-discriminatory institutions, matters as much as handing out cash.
- Respect for Agency: rather than imposing a set way of life, it aims to help people choose the lives they themselves value.
Of course, it has its limits. Achieved functionings are visible, but capabilities, the opportunities a person could have enjoyed, are hard to measure directly. There is also an ongoing debate among scholars over which capabilities should count as important: Nussbaum proposed a list, while Sen argued that rather than fixing a list, a society should decide through open public discussion.
The capability approach proposes that welfare be judged not by how much was handed out, but by what people have actually become able to do and to be. It reminds us that the same money and the same goods can lead to entirely different lives depending on the conditions of one's body, society and environment.
Looking beyond what we have to what we can and cannot actually do is the first step in thinking toward a fairer kind of welfare.
