Biological Market examples

grooming in primates: trading grooming for tolerance

two juveniles of the chacma baboon group 'Eburru Cliffs' (Gilgil, Kenya) groom an adult male (Photo: R. Noë)

Peter Henzi and Louise Barrett pointed out that 'tolerance' is another important commodity that can be traded. This explains why the asymmetry in grooming between a dominant and a subordinate is strongest when resources are scarce and can be monopolized by a single animal. Rebecca Chancellor and Lynne Isbell (2008) point out that market effects also influence grooming patterns under scramble competition.

Markus Port and colleagues (2009) showed how important tolerance is for our understanding of grooming in primates. Their analysis reveals the effect of market forces in grooming patterns that superficially seem to adhere to the reciprocal altruism model.

Barbara Tiddi and colleagues (2011) provided an important contribution to the discussion by testing the relative predictive power of dyadic reciprocity driven exchanges (as predicted by the reciprocal altruism paradigm) against partner choice driven exchanges (as predicted by the biological markets paradigm) in capuchins foraging on baited platforms. Their results confirm a number of  convictions I have had for years: partner choice is much more important than partner control; tolerance is an important commodity traded on monkey markets and primate cooperation among unrelated individuals is driven by "attitudinal partner choice" (Fruteau et al 2009; the partner choice based form of de Waal's (2000) "attitudinal reciprocity").

Sick and colleagues (2014) found that grooming for tolerance in chacma baboons occurs mainly in the morning and ebbs off later in the day when bellies fill up.

Together these results confirm a number of  convictions I have had for years: partner choice is much more important than partner control; tolerance is an important commodity traded on monkey markets and primate cooperation among unrelated individuals is driven by "attitudinal partner choice" (Fruteau et al 2009; the partner choice based form of de Waal's (2000) "attitudinal reciprocity").

last update: 29 SEP 2021