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social dynamics

You work less when you are in a group.

Latané, Williams, and Harkins (1979) demonstrated social loafing by measuring tasks like shouting and clapping to isolate motivational loss from coordination loss.

The rope-pulling experiment is associated with the earlier Ringelmann effect (1913), which confounded physical coordination issues with motivational decline.

Collaboration often masks a quiet, individual decline in personal accountability.

Where this comes from

Study
Latane, Williams, and Harkins, 1979
What the check found
The definition and the 1979 source are accurate, but the example of rope-pulling specifically belongs to the Ringelmann effect (1913), not the study that coined and empirically isolated 'social loafing'.
Confidence
Solid, with limits
social-dynamicsgroup-behaviorworkplace

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.