Prospect theory has been advanced as one way to link intentional rebellious action and the influence of social conditions on individual decisions to support such action. This study extends the application of prospect theory by explaining tendencies toward action or inaction among individuals within identical social contexts. Put simply, the way in which people define reference points has an effect on how they perceive violent options. These perceptions may invoke inaction biases among members of a constituent community. This explanation is explored with illustrative examples drawn from interviews with individuals who supported or did not support rebellious action in Northern Ireland (in 1998) and in the West Bank and Gaza Strip (in 1999). The interview data suggest that territorial demands are an important factor in how rebellious options are perceived.KEY WORDS: prospect theory, collective action, ethnonational rebellion, territoriality Students of political behavior in general, and of violent behavior specifically, must at some point address the issue of participation versus nonparticipation. Participants in violent action engage in, or threaten, coercion for political ends. The costs of participation tend to be very high; the benefit of such action is a simple public good shared equally by all, regardless of whether they participate. As such, the tendency to free-ride on the efforts of others is strong, hence few participants seek the public good. However, to acquire the public good often requires that many people participate. Thus, the task facing rebels is to overcome free riding in order to acquire the public good.In Mark Irving Lichbach's The Rebel 's Dilemma (1995), the author identifies a series of solutions to the free-rider problem, all centering on how to alter costbenefit analysis in order to mobilize potential participants. One solution is referred to as "changing the type of public good" or "seeking public bads" (Lichbach, 1995, p. 107). In basic form, the solution suggests: "The initial task of the revo-