Brusse, CarlSterelny, Kim2025-05-232025-05-230140-525XPubMed:39743808ORCID:/0000-0001-5732-8750/work/184102683WOS:001387815500001http://www.scopus.com/inward/record.url?scp=85214341438&partnerID=8YFLogxKhttps://hdl.handle.net/1885/733751544The explanatory model proposed by Sijilmassi et al. appeals to fitness interdependence, and is highly plausible for small-scale societies. We argue that it is less so in the context of the larger societies that much of their empirical evidence is drawn from, and that this is because fitness interdependence does not readily scale up in the way the model requires.This research was supported by Australian Research Council (ARC) Discovery Project grant DP210102513.5enCopyright © The Author(s), 2025.2025-01-0210.1017/S0140525X2400062185214341438