Circular Reasoning: Definition & Examples
Circular reasoning (also called circular logic) is a logical fallacy in which the conclusion of an argument is assumed in one of its premises. Instead of providing independent evidence for a claim, the argument simply restates the claim in different words — going in a circle rather than moving forward.
The Pattern
A is true because of B. B is true because of A.
No new evidence is introduced — the argument just goes in circles.
Why Circular Reasoning Is a Fallacy
A valid argument provides independent evidence for its conclusion. Circular reasoning fails this test because the "evidence" is just the conclusion rephrased. It might sound logical — the sentences connect grammatically and the reasoning flows — but no actual support is provided. You end up exactly where you started.
Circular reasoning is tricky because it can be hidden inside longer, more complex arguments. When the circle is large enough — spanning multiple sentences or paragraphs — the reader may not notice that the argument never introduced any independent evidence. This is why it's sometimes called a "vicious circle" in formal logic.
Circular Reasoning vs. Begging the Question
Circular reasoning and begging the question are closely related — some logicians treat them as synonymous, while others draw a distinction. In general, begging the question (petitio principii) refers specifically to assuming the conclusion as a premise, while circular reasoning is the broader pattern of using A to prove B and B to prove A. In practice, the terms are often used interchangeably.
Circular Reasoning Examples
Circular Reasoning in Arguments
- —"I'm trustworthy because I always tell the truth, and I know I always tell the truth because I'm a trustworthy person." — Trustworthiness is used to prove itself.
- —"This is the best restaurant in town because no other restaurant is as good." — The conclusion simply restates the premise in different words.
- —"Freedom of speech is important because people should be allowed to say what they want." — The right to speak freely is "proven" by asserting the right to speak freely.
- —"The law is fair because it was created through a fair process, and we know the process is fair because it produced fair laws." — Each claim depends on the other.
- —"She's the most qualified candidate because she has the best qualifications." — The conclusion is just a restatement of the premise.
Circular Reasoning in Advertising
- —"Our product is the market leader because more people buy it than any other brand, and people buy it because it's the market leader." — Popularity proves itself.
- —"You should trust our reviews because we only publish honest reviews, and you can tell they're honest because we're a trustworthy source." — Credibility is self-referential.
- —"This is a premium brand because we charge premium prices." — High price is used as evidence of high quality, which is used to justify the high price.
- —"Our customers are satisfied — just look at our satisfaction ratings." (Where ratings come from pre-selected happy customers.) — The evidence is rigged to support the conclusion.
- —"We're the best because nobody does it like we do." — Uniqueness is claimed as proof of superiority without independent evidence.
Circular Reasoning in Philosophy & Religion
- —"God exists because the Bible says so, and the Bible is true because it's the word of God." — The most cited example of circular reasoning in philosophy.
- —"Morality comes from reason, and we know reason is moral because reasonable people are moral." — Reason and morality are used to validate each other.
- —"The universe must have a purpose because everything in it seems purposeful." — Assumes purposefulness to prove purpose.
- —"We have free will because we can choose our actions, and we can choose our actions because we have free will." — Free will is its own evidence.
- —"Consciousness must be non-physical because it can't be explained by physical processes, and physical processes can't explain it because it's non-physical." — The conclusion is embedded in the premise.
Circular Reasoning in Everyday Life
- —"I deserve a raise because I'm underpaid, and I know I'm underpaid because I deserve a raise." — The claim and its justification are identical.
- —"He's a great leader because people follow him, and people follow him because he's a great leader." — Leadership and followership validate each other circularly.
- —"That movie must be good because it was popular, and it was popular because it's good." — Quality and popularity are treated as interchangeable.
- —"I'm right because I have good judgment, and I know I have good judgment because I'm usually right." — Self-assessment used to validate itself.
- —"Organic food is healthier because it's natural, and natural things are healthier because they're organic." — "Natural" and "organic" are treated as self-evident proofs of health.
How to Spot Circular Reasoning
Strip the argument down to its core claim and its evidence. If the evidence is just a restatement of the claim — even in fancier language — the reasoning is circular. Ask: "If I didn't already accept the conclusion, would this evidence convince me?" If the answer is no, you've found circular reasoning.
Watch for arguments where the premise and conclusion use the same concept in different words: "This policy is effective because it produces good results" (effective = good results). Or where two claims support each other with no external evidence: "A proves B, and B proves A." In formal writing, this pattern is easier to spot when you outline the argument's structure.
How to Avoid Circular Reasoning in Your Writing
Always support your claims with independent evidence — facts, data, examples, or expert testimony that don't depend on the truth of your conclusion. When editing your own work, read each argument backward: does the evidence stand on its own, or does it collapse without the conclusion? If your argument only works when the reader already agrees with you, it's circular.
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