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In this paper, we discuss the results from ethnographic and informance work related to transactions in retail settings as related to the design of interactive ubiquitous computing systems. We find that - for practical considerations of design and implementation - transactions can be represented as balanced exchanges in the context of a trust relationship. We've proposed that such exchanges become trusted - and that trust must be accommodated - through at least three characteristics of social systems as applied to transactions: accountability, real-time inspectability and the capacity to exercise recourse. In this paper, we extend further recent work on designing for accountability (Eriksén, 2002). We suggest that ubiquitous computing technologies applied to transactions in general and, retail transactions more specifically, need to explicitly consider these characteristics in their design to support trusted, balanced exchanges.