CONCEPT
Capabilities vs. Functionings
Nussbaum's analytical distinction between what a person actually does or is (functioning) and the real freedom to do or be it (capability) — the instrument that cuts through the central confusion of the AI discourse.
A functioning is something that exists in the world — an essay written, code compiled, a product shipped. A capability is what a person can actually do and be — the internal capacity developed through the process of producing. The distinction matters because justice requires providing capabilities, not mandating functionings; and because, under AI conditions, the relationship between the two has become severable in historically unprecedented ways. A world full of extraordinary outputs can also be a world in which the people producing them are becoming less capable. The product improves while the person plateaus. The functioning exists. The capability does not.
In The You On AI Field Guide
The distinction is foundational to the capabilities approach Nussbaum developed with Amartya Sen. The approach evaluates societies not by their aggregate production but by what real freedoms — what genuine opportunities for functioning — are available to each individual. This refusal to measure in aggregates alone is