Abstract
In the name of efficiency, organizations and governments around the world are increasingly trimming redundancy---personnel or overlapping capabilities beyond what routine operations require. Drawing on distributed computing and cognitive science, we challenge this view. Using queueing simulations and a preregistered multiplayer experiment (N = 832 in 187 teams of 3–6), we show that redundancy improves performance through two distinct routes. Adding collaborators to a team improves resilience, with larger teams completing more tasks when members became temporarily unable to contribute. Giving team members overlapping capabilities also improved efficiency, with teams in which collaborators could perform multiple roles completing substantially more work. These findings suggest that efforts to improve short-term efficiency by reducing redundancy may come at a cost, quietly eroding a team’s capacity to withstand unexpected failures.