Argument ad populum ("argument from popular appeal", "appeal to the majority") is a logical fallacy whereby a proposition is claimed to be true because it is believed by large numbers of people.
- "Fifty million Elvis fans can't be wrong."
- "90% of the people in the world believe in God. Are you saying that all of them are wrong?"
Argumentum ad populum is a fallacy because the fact that many people believe something does not make it true. For many years, most people believed that the Earth was the center and most important feature of the universe. Millions of people believe that astrology works. Neither is true.