Hardliners Can Help or Hurt Group Effort

In many models, people who always cooperate are thought to boost teamwork. But those models force everyone to join. New research looks at a situation where people can also sit out. This change matters because real life often lets people opt out.

Participants can choose to work together, slack off, or stay out. Those who stay out get a fixed payoff and can also change the overall outcome. The fixed payoff is like a safety net that does not depend on the group's success.

Using a simple comparison method in a large mixed group, the study shows that the always-cooperators don't always help. They improve teamwork only when their numbers are moderate and the outsiders hurt the shared result. When the outsiders lower the shared pool, a modest number of hardliners can lift the group's effort.

If there are too many always-cooperators or the outsiders do not damage the shared result, the always-cooperators actually make things worse. Their effect depends on how many there are and what the outsiders do. But if the outsiders are neutral or helpful, adding more hardliners can crowd out flexible players and reduce overall effort.