Final answer:
Independent group contingency capitalizes least on positive peer pressure because each member's reward is based on their performance, not influenced by the performance of others.
Step-by-step explanation:
The type of group contingency that capitalizes least on positive peer pressure is the independent group contingency. In this setup, each member of the group is rewarded based on their performance, regardless of how other group members perform. Unlike dependent and interdependent contingencies, where the performance of others can influence an individual's reinforcement, the independent contingency does not incentivize members to exert peer pressure on one another to meet a common goal.