By Dr Ariel Vázquez Carranza, lecturer at University of Guadalajara
Epistemic asymmetry may be considered as a defining characteristic of institutional talk (Drew 1991; Drew and Heritage 1992): it is common to find institutional contexts where one of the participants has (professional) expertise in the business at hand; and such organisation of knowledge between the participants (i.e., one knowing more, K+, than the other, K-) outlines the sequential and linguistic design of the interaction (Heritage and Raymond 2005; Heritage 2013; Drew 2018). For instance, this has been described for medical encounters (e.g., Strong 1979; Silverman 1987; Maynard 1991; Heath 1992, inter alia), courtroom interactions (e.g., Drew 1992; Komter 1995; inter alia), guided tours (Mondada 2013), service encounters (Lee 2016), etc. In the present analysis I look at instances of epistemic asymmetry in a 25-hour corpus of commercial interactions in a Mexican fruit and vegetable shop. I focus on how the epistemic congruence is maintained.