This article considers the extent and nature of student participation in a trade bargaining simulation from a community of practice perspective. This third-year economics module included a blend of online communication (through email, online chats and online discussions) and face-to-face meetings, both in smaller bargaining groups and in whole class plenary meetings. Our method of analysis includes the use of Exchange Structure Analysis of text chats and face-to-face learning conversations, triangulated by observation, survey and interview data. The focus on community of practice enables us to offer a nuanced interpretation of differences in crude participation data derived from the online chats. Superficially, the data may suggest marginalisation of participants, but Wenger's (1988) notion of peripheral participation with a trajectory towards full participation reframes the disparities in terms of an active community of practice. Some members are fully engaged with the practices of trade bargaining from the early stages of the simulation, while others move towards full participation over the duration of the simulation. Our results suggest that the laboratory-based online text chats did provide opportunities for student participation in the simulation, and that male and female students exhibited different patterns of participation in the chats.