The AI Journal

A fine Maori cloak, kahu kiwi, feathered with kiwi down and handed down through a lineage for four generations, cannot be bought. It can be given, inherited, or lost as a spoil in intertribal grievance, but a stranger with an unlimited chequebook cannot walk away with one, not because no price would be named but because naming a price is the one transaction the object cannot survive: sold, it stops being a taonga and becomes a rug. Annette Weiner catalogued this class of object in a 1985 paper on the Maori concept of hau, and generalised it seven years later into a full theory of what she called inalienable possessions — wealth deliberately kept out of ordinary circulation because circulating it would dissolve the very difference, of rank, lineage or standing, that the object exists to hold in place. Weiner’s fuller case ranged beyond New Zealand: the same logic explained why Trobriand chiefly rank depended on women’s fibre wealth that never left the matrilineage, and why the Kula valuables that famously circulate between islands are, on her account, secondary to a harder currency of identity that does not circulate at all.

Two years after Weiner’s initial paper, and without citing it, the legal theorist Margaret Jane Radin proposed in the Harvard Law Review a concept she called market-inalienability: certain entitlements — a kidney, a vote, a child placed for adoption, a wedding ring — may permissibly be given away but not sold, because a market in them works a harm that the seller’s consent does not cure. Radin was answering a dispute entirely internal to American law: whether the freedom-of-contract logic that had by the 1980s colonised much of private law ought to extend to baby-selling and commercial surrogacy, both live litigation questions when she wrote. Weiner was answering a dispute entirely internal to economic anthropology: whether Marcel Mauss’s account of the gift, in which every object given creates an obligation to reciprocate, could explain why certain Melanesian and Polynesian valuables plainly did not circulate on that logic at all, but sat inert within a lineage for generations before reappearing, sometimes decades later, in a descendant’s hands. Chris Gregory’s 1982 study of Papua New Guinea’s colonial economy had already shown that gift and commodity exchange do not sit on either side of a primitive-to-modern line; the two logics run side by side in the same society, applied to different classes of object. What sorts an object into one class or the other, on Weiner’s account, is exactly the inalienability question: whether its role is to move value between people or to keep a particular identity fixed against the movement of everything else.

Set the two theories beside each other and the equivalence is closer than family resemblance. Both begin from the same puzzle: an object a rational bargainer should be willing to sell at the right price is, empirically, never sold, and its owners describe the refusal not as reluctance but as a category error, as though the sale were unintelligible rather than merely imprudent. Both locate the explanation in the same place: the object is constitutive of a status — Radin’s word is personhood, Weiner’s is identity and rank — rather than merely useful to it, so that alienating it does not just cost the owner something but changes who the owner is. And both derive the same asymmetry from that premise: the gift is permitted and the sale is not, because a gift preserves a claim that survives the transfer (Weiner’s keeping-while-giving, in which the giver’s stake in the object can reassert itself generations later) or a relationship between giver and recipient (Radin’s account of gifts as expressions rather than alienations of the self), while a price severs it outright. Neither author drew on the other’s discipline. Radin’s footnotes run to constitutional theory, feminist jurisprudence and law and economics; Weiner’s run to Malinowski, Mauss and the ethnography of the Trobriands and the Maori. The theories were not triangulated from a shared source. They were derived twice, from different data, because the same structural problem — how a society keeps one class of goods perpetually outside the market it otherwise runs on — has one solution wherever it is posed. The dates are not incidental. Both theories crystallised within the same half-decade out of the same wider disciplinary crisis over whether market logic could be treated as universal — law asking whether contract could legitimately reach any transfer, anthropology asking whether market society had ever really been the historical exception Mauss assumed it was.

The strongest objection to treating this convergence as significant is Walter Block’s 1999 reply to Radin, which argues that market-inalienability, however elegantly derived, functions in practice as paternalism dressed as structure: telling a woman she may not sell a kidney, or her reproductive labour, while permitting her to donate either, does not protect her personhood, it removes an option a poor seller might rationally want, at no cost to a rich buyer who is denied nothing. Block’s libertarian case is that the harm Radin locates in the sale is not intrinsic to the transaction but a judgment about what the seller ought to value, imposed on the people least able to afford having their options narrowed for them. That objection lands, and it lands hardest exactly where Radin’s theory reaches furthest beyond the cases Weiner actually documented — organs, surrogacy, sex work, goods whose status is itself contested, where whether the object is truly identity-constitutive is the very question in dispute and where the seller’s own account of the transaction, that it is simply a transaction, is the evidence Radin’s framework has to override. It does not land the same way against the narrower class Weiner described, because there the marker of identity-constitution is not a contested philosophical judgment applied to a disputed case; it is an observed social fact, attested by what happens to the object’s meaning the moment it is sold, independent of any theorist’s view about what a seller ought to want. A kahu kiwi sold to a museum does not stop being warm; it stops being an ancestor’s cloak, and the Maori communities that have spent decades negotiating the return of exactly such objects are not disputing a philosopher’s inference. They are describing what the sale did.

That narrows what the convergence is evidence for. It supports the shared mechanism wherever independent evidence, ethnographic or historical, already shows that an object’s transfer for value strips a status the object was built to carry: heirlooms, sacred or ceremonial valuables, certain offices and titles, arguably the wedding ring itself, which functions across widely separated legal and kinship systems as a transferable but non-purchasable mark of one specific relationship. It does not support extending market-inalienability to any good a legislature or a theorist newly decides is identity-constitutive, because that is precisely the move neither Weiner’s ethnography nor Radin’s own doctrinal cases license: in both accounts, inalienability is discovered in how a society already treats an object, not assigned to it by argument. The two disciplines converged because they were reading off the same kind of fact from two unrelated archives. Where that fact is absent, so is the convergence, and so is the case for the rule. A judgeship or a hereditary title shows the same pattern for the same reason: each can be conferred, inherited or renounced, but a judge who sold a verdict and a chief who sold a title would not be misusing the office, they would be dissolving it.