Throughout the text, we use the plural pronouns “they” and “them” to refer to individual (i.e., singular) “agents” in mathematical and computational models of social learning. This usage follows the practice in the relevant academic literature. Although it may seem strange to some readers, the idea is to both (1) avoid assigning a gender to an abstract entity and (2) preserve the sense of “agency” of those entities, which would be lost if one were to use the singular “it.”