Quickly register to comment, Ask questions, and/or keep up to date on new fallacies.
Register!

one moment please...




Quantifier-Shift Fallacy

  Get the Book!


Get the book, Logically Fallacious by Bo Bennett, PhD by selecting one of the following options:


Get It!

(also known as: illicit quantifier shift)

Description: A fallacy of reversing the order of two quantifiers.

Logical Form:

Every X has a related Y.

Therefore, there is some Y related to every X.

Example #1:

Everybody has a mother.

Therefore, there is some woman out there who is the mother of us all.

Explanation: While it is true that everyone has (or had) a mother, the term “mother” is not a singular term that is shared -- it is implied that it is a category in which many mothers reside.  The conclusion is asserting the opposite of the meaning -- that there is actually just one mother shared by everyone.  This form of reasoning is invalid; therefore, fallacious.

Example #2:

Everybody has a brain.

Therefore, there is a single brain we all share.

Explanation: Everybody has his or her own brain, not one we all share.  Although I have met many people who seem not to have their own brain.  This form of reasoning is invalid; therefore, fallacious.

Exception: None.



Registered User Comments



Privacy Policy Technical Support
 Copyright 2017, Archieboy Holdings, LLC.