Fallacy · Leaning on the wrong support
Bandwagon
Also called: Appeal to popularity, ad populum
Treating a claim as true because many people believe it.
What it is
Numbers of believers are not evidence about the world. Many people once held that the Sun circles the Earth. Popularity can be a hint worth checking, but the question is what the believers are basing it on, and whether they each checked or simply copied one another.
An example
“Millions of people use this supplement, so it must work.” Millions of people may also have bought it because millions of others did.
How to spot it
The main support is “everyone” or “most people”, with nothing about why they believe it.
How to answer it
“What is the evidence that convinced them?”
When it is not a fallacy
Agreement counts when the people agreeing have each looked at the evidence independently, as with a scientific consensus.
Printable sheet of all fallacies
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A plain reference you can paste into notes or an essay:
Quest2Reason. “Bandwagon.” https://quest2reason.com/learn/ideas/fallacies/bandwagon. Accessed 13 November 2026.