In order for traditional rational choice theory to explain the production of collective action, it must be able to distinguish between two behaviorally identical possibilities: one, that all of the agents in a group are each performing behaviors in pursuit of a set of individual actions; and two, that all of those agents are performing those behaviors in pursuit of a collective action. I argue that RCT does not have the resources necessary to distinguish between these two possibilities. RCT could distinguish between these possibilities if it were able to account for commitments. I argue that successful rational choice explanations of collective action appeal to commitments, and distinguish this way of explaining collective action from a general class of explanations called plural subject theories.