There has recently been increasing interest in group decision making, and in particular the mechanisms through which a group of individuals can arrive at a consensus decision. In this paper we investigate the effects of resource availability upon consensus decision making in a primate group. We extend an existing agent-based model of primate decision making to incorporate a model of diminishing foraging returns, and show that the difficulty of obtaining energy from the environment has an impact on successful strategies for consensus decision making in such groups. Moreover,