Full Idea
Causal overdetermination is when an effect has more than one cause, and each event would have caused the effect if the other one had not done so.
Gist of Idea
Overdetermination occurs if two events cause an effect, when each would have caused it alone
Source
Tim Crane (Elements of Mind [2001], 2.13)
Book Reference
Crane,Tim: 'Elements of Mind' [OUP 2001], p.49
A Reaction
Overdetermination is a symptom that an explanation is questionable, but it can occur. Two strong people can join to push over a light hatstand.