Inequality Reexamined

The default variable, in policy and in most of economics, is income — or its close cousins, wealth and command over commodities. It has obvious appeal. Money is countable, comparable, and it seems to stand in for everything else a person might want, since with enough of it you can buy your way toward most goods. Draw a poverty line in dollars, count the people below it, and you have a tidy picture of disadvantage. Sen does not deny that income matters. His objection is that income is a means, and we have quietly mistaken it for the end.

What we actually care about, he insists, is not the coins in someone's hand but what those coins let them become and do. And the rate at which income converts into a decent life varies wildly from person to person. A person with a disability may need far more money than a healthy neighbor to achieve the same mobility — and may also earn less, a double disadvantage that an income count renders invisible. Someone in a malarial region, or an old person, or a pregnant woman, or a laborer doing heavy physical work all need more resources simply to reach the same level of ordinary functioning.

Sen's answer is built from two linked ideas: functionings and capability. A functioning is anything a person manages to be or to do — being adequately nourished, being in good health, avoiding premature death, but also being able to read, to take part in the life of the community, to appear in public without shame, to move about freely. Functionings range from the elementary and physical to the complex and social. They are the constituent parts of a life, the states and activities that make it the life it is.

Capability is the step that makes the framework distinctive. It is not the functionings a person happens to have achieved, but the set of functionings genuinely available to them — the real alternatives among which they can choose. Two people may both be fasting, thin and hungry; one is starving because there is no food, the other is fasting by choice on a full plate. Their functionings look identical, but their capabilities are worlds apart. One has no option; the other declined an option. Capability captures freedom — the range of lives a person could actually lead — and Sen argues that this freedom, not the particular outcome selected, is what a just society owes its members.

Step back and the reason this argument matters becomes hard to dodge. The choice of the space in which we measure equality is not a preliminary technicality that clears the way for the real politics. It is the real politics, decided in advance and then hidden inside the numbers. When a government tracks poverty in dollars, it has already made a moral ruling — that the extra needs of the sick, the disabled, the old, the burdened do not count as disadvantage until they show up as lost income. The metric quietly draws the line between who is badly off and who is not, and by the time policy arrives the crucial decision has already been made.

This is why Sen treats the "equality of what" question as more than a philosopher's puzzle. Whatever variable a society chooses to equalize becomes the thing its institutions notice, count, and try to fix — and everything outside that variable falls into a blind spot. Equalize incomes and your programs will chase incomes while ignoring whether people can actually convert them into health or participation. Equalize capability and you are forced to see the woman who earns the same as her neighbor but can do far less with it. The yardstick does not just describe the injustice; it decides which injustices the state is even equipped to perceive.

Sen ends roughly where he began, but the ground has shifted underfoot. The old contest between the champions and the critics of equality turns out to have been a quarrel over which variable to hold sacred, conducted by people who all, in their different ways, wanted equality of something. Once that is clear, the pressure moves onto the question they were avoiding. Equality of what? Sen's wager is that the honest answer is capability — the real freedom people have to live lives they have reason to value — because it is the only space that refuses to look past human diversity, adaptation, and the uneven way resources become living.