Common cause

Definition and stakes

George Hastings McNair,  A Class Room Logic

“ Uncertainty of conclusion.
(a) Plurality of causes is mentioned by Mill as constituting the “characteristic imperfection” of the method of agreement. As the term signifies, plurality of causes represents a condition where a given phenomenon has more than one cause, or where different causes produce the same effect. For example, “A poor crop” may be due to drought, neglect, pests, etc.; heat may be caused by friction, electricity, combustion. Unfavorable home conditions; ill health; dislike for teacher—any one of these might be followed by irregular attendance.
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Source: Gutenberg

Richard C. Cabot,  Social Work; Essays on the Meeting Ground of Doctor and Social Worker

“ Above all, she should realize the multiplicity of causes which science more and more clearly recognizes in their single result. She should learn both by precept and by experience that for a single fact such as disease or health there are always many causes, so that any one who points confidently to a single cause, such as cold, fatigue, bacteria, or worry as a sufficient explanation of a person's disease, is almost certain to be wrong. ”
Source: Gutenberg

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