Abstract: Information sharing is crucial in responding to and managing crises. A great variety of organizations respond to crises, ranging from international organizations, through non-governmental organizations, commercial suppliers, government ministries, and the media, to individual volunteers. At best, they collaborate to combine their respective strengths in creating synergy. At worst, they deconflict their operations so that the one does not get in the way of the other. In either case, the organizations must communicate with one another. Previous research has shown that this communication takes the form of an information market. This paper considers the possible mechanisms for information markets in humanitarian and military coalitions. While there has been work on market mechanisms in the economics literature, this needs to be adapted for the exchange of information and information services instead of physical goods and services. This paper proposes a taxonomy of market mechanisms that is tailored to information sharing within coalitions. © 2012 ISCRAM.