fallacy of composition
A logical fallacy where one assumes that what is true for a part is also true for the whole. Used in philosophy, economics, and critical thinking contexts.
A classic example of the fallacy of composition is that just because one person can see better by standing up, it doesn't mean everyone will see better if they all stand up.
The opposite fallacy: assuming what is true of the whole must be true of its parts.
From 合成 (composition) + の + 誤謬 (fallacy). A direct translation of the English logical term 'fallacy of composition'.