Final answer:
Reinforcer: [Behavior of individual/group] leads to [positive consequence] for the group. (e.g., completing a task results in a break for everyone.)
Step-by-step explanation:
Reinforcement is a learning principle that involves strengthening or weakening a behavior in response to its consequences. In the context of group behavior, when a positive consequence is contingent on the behavior of an individual or small group of individuals, it serves as a reinforcer for the group as a whole.
This means that the group is more likely to exhibit that behavior in the future because it has been associated with a positive outcome. For example, if completing a task results in a break for everyone, individuals are more likely to work together to complete the task because they know it will lead to a desirable outcome for the group. This can promote cooperation and teamwork within the group.