Public goods

Public goods are goods that are both non-excludable (it is impossible or prohibitively costly to prevent non-payers from consuming them) and non-rivalrous (one person's consumption does not diminish another's). National defense, clean air, scientific knowledge, and open-source software are canonical examples. Markets systematically underprovide public goods because the free-rider problem collapses individual incentives to contribute, making non-market provision — taxation, regulation, or voluntary coordination — the only viable alternatives.

Public goods are not merely an economic category; they are a collective action problem crystallized into a market structure. The question is not whether public goods should exist — they exist whether we provision them or not — but whether we can design institutional mechanisms that transform free-riding into contribution without destroying the non-excludability that makes the good public in the first place.

The tragedy of public goods is not that they are underprovided. It is that we keep treating them as private goods that haven't found their market yet, when the entire point is that their value lies precisely in escaping market logic.