The two secondary works most often used to connect Nozick's 'genetic supermarket' and Agar's 'liberal eugenics' cite them separately — adjacent footnotes in one, different sections in the other — not as a citation chain
Two works stand out among sources connecting Robert Nozick's "genetic supermarket" footnote to Nicholas Agar's "liberal eugenics": Chris Gyngell and Thomas Douglas's 2015 Bioethics article "Stocking the Genetic Supermarket," and the Stanford Encyclopedia of Philosophy's "Eugenics" entry (substantive revision 2022, Inmaculada de Melo-Martin and Sara Goering). Both cite the two authors to separate apparatus, never to each other — but the distance between the two citations differs sharply, and the difference is worth recording precisely. Gyngell and Douglas's footnote 4 (Agar 1998, Agar 2004, Buchanan et al., Harris, Glover, Singer) sits beside footnote 5 (Nozick, Anarchy, State, and Utopia, 1974, p. 315) in the same paragraph — two adjacent footnotes on consecutive sentences, never merged into one citing the other. In the SEP entry the two are not adjacent at all: the "genetic supermarket" attribution to Nozick sits in §2.2, on a spectrum running "from a completely laissez-faire market system ... to a more highly regulated system" whose other pole is credited to Buchanan et al. 2000, while the entry's citations to Agar 2004 fall in §2.1, §2.2.2 and §3.2 — different sections, as parenthetical citations rather than footnotes, with no sentence placing Nozick and Agar together.
Neither source demonstrates that Agar's own writing cites Nozick; both demonstrate that two independent works treat Nozick and Agar as separately-sourced authorities inside one survey of liberal-eugenic positions, which is the structural signature of retrospective synthesis rather than documented citation. Routed to question-verify-agar-1998-cites-nozick-directly, which this finding narrows but does not close: it remains possible Agar cites Nozick somewhere these two secondary works simply didn't flag.
Source
“A popular class of responses to the second question come under the banner of 'liberal eugenics'.4 [...] One of the earliest descriptions of such an approach is found in Robert Nozick's Anarchy, State, and Utopia. Nozick advocates a 'genetic supermarket':5”
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