Oddly Wired
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social dynamics

You exert less effort when working in a group.

The Ringelmann effect, or social loafing, shows that individuals contribute less energy to a shared task than they do when working alone.

As group size increases, individual effort drops proportionally. This happens because individual accountability becomes diffuse and the perceived impact of your personal contribution diminishes. You unknowingly scale your effort to match the collective output.

You are a different worker when you think you are blending in.

Where this comes from

Study
Maximilian Ringelmann, 1913
What the check found
The claim is accurate in its general premise, though historically Ringelmann's effect involved significant coordination loss, whereas 'social loafing' specifically refers to the motivational component.
Confidence
Well replicated

Related

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