LogicalMANIPULATIVE

Circular Reasoning

What it is

An argument structure where the conclusion is used as one of its own premises, creating a loop that proves nothing.

How it works

Unlike simple question-begging, circular reasoning can involve longer chains that loop back to the starting point. A supports B, B supports C, and C supports A. Each step seems to provide evidence, but the entire structure is self-referential. The longer the chain, the harder it is to detect the circularity.

Real-world examples

  • •"This news source is reliable because the fact-checkers say so, and I trust the fact-checkers because this news source recommends them."
  • •"The law is just because it was passed by legitimate authorities, who are legitimate because they follow the law."
  • •"The market price is fair because that's what buyers will pay, and buyers pay that because the price is fair."

Ethical guidelines

  • ●Arguments must eventually ground out in independently verifiable premises.
  • ●Self-referential justification systems are intellectually closed and resistant to correction.
  • ●Honest reasoning requires at least one premise that doesn't depend on the conclusion.

How to defend against it

  • ►Trace the chain of evidence: does it eventually ground out in independent facts, or loop back?
  • ►For any key claim, ask: "What would change my mind about this?" If nothing would, it may be circular.
  • ►Map out the logical structure of an argument to expose hidden loops.

From the Defense Playbook

Argument Mappingtakes practice

Draw the argument as a diagram, with the main claim at the top, the reasons for and objections against it beneath, and the support for each of those beneath them, so that gaps, repetition, and unsupported leaps become visible instead of being carried along by fluent prose.

Every playbook entry states how strong its evidence is and when not to use it. Browse the full playbook.

References

  1. Walton, D. (1991). Begging the Question: Circular Reasoning as a Tactic of Argumentation. Greenwood Press
    Analyses circularity in extended chains of argument using argument diagrams, showing how a conclusion can depend on itself through several intermediate steps — the entry's A-supports-B-supports-C-supports-A structure and its point that longer chains hide the loop.
  2. Hamblin, C. L. (1970). Fallacies. Methuen
    Historical treatment of circular argument (circulus in probando) and its relation to petitio principii, and of why a self-supporting argument proves nothing.
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