The Ringelmann Effect

“1 + 1 < 2”

The Ringelmann Effect is the tendency for individual members of a group to become increasingly less productive as the size of their group increases. It was discovered by French agricultural engineer Max Ringelmann in 1913. He asked people to pull on a rope, first alone, and then in groups.

The Findings

• Alone: 100% effort.
• Group of 3: 85% effort per person.
• Group of 8: 49% effort per person. As the group grew, the total force increased, but the individual force dropped dramatically.

Why It Happens (Social Loafing)

1. Loss of Motivation: “Someone else will do it.” When credit and blame are shared, the incentive to excel vanishes.
2. Loss of Coordination: It’s harder to pull a rope (or write code, or move a sofa) in perfect sync with 8 people than with 2.

Application: The Bezos “Two-Pizza Rule”

Jeff Bezos at Amazon famously implemented the Two-Pizza Rule:

“If a team can’t be fed with two pizzas, it’s too big.”

Small teams (5-7 people) prevent the Ringelmann Effect because:

• Everyone is visible (no place to hide).
• Coordination costs are low.
• Individual contribution is clear.

Conclusion

Adding more people to a late project makes it later (Brooks’s Law). To maximize output, don’t just add bodies. Break large teams into small, autonomous squads where individual impact is undeniable.