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generic_generalisation
Generic generalisation occurs when a generic statement — one that captures a typical or characteristic property of a kind — is treated as a strict universal claim. Generic sentences like 'dogs have four legs' or 'mosquitoes carry malaria' express statistical tendencies, characteristic features, or normative expectations, but they tolerate exceptions. The fallacy arises when these defeasible generics are deployed as though they were exceptionless universal quantifications, licensing conclusions about specific individuals.
"Men are taller than women. Therefore, any given man must be taller than any given woman, and if he's not, that's unusual."
A manager tells a job applicant: 'Millennials are entitled and don't like hard work, so I'm not sure you'll be a good fit for our demanding culture' — applying a contested generalisation about a generation to a specific individual.
After reading that dogs are friendly and social animals, a visitor reaches out to pet a stranger's dog without asking, reasoning that since dogs are friendly, this particular dog must welcome the attention.
Binary (yes/no) questions an LLM must answer to identify this aspect:
Does the argument use a generic statement (e.g., 'birds fly', 'politicians lie') as though it applies universally to all members of the category?
Type: binaryDoes the conclusion treat the generic as a strict universal quantification (all X are Y)?
Type: binaryAre there known or obvious exceptions to the generic statement that the argument ignores?
Type: binaryGeneric generalisation occurs when a generic statement — one that captures a typical or characteristic property of a kind — is treated as a strict universal claim. Generic sentences like 'dogs have four legs' or 'mosquitoes carry malaria' express statistical tendencies, characteristic features, or normative expectations, but they tolerate exceptions. The fallacy arises when these defeasible generics are deployed as though they were exceptionless universal quantifications, licensing conclusions about specific individuals.
Generic statements are linguistically unmarked — they lack explicit quantifiers — which makes them cognitively easy to process but semantically underspecified. Listeners unconsciously fill in the quantificational force based on context, typically defaulting to something stronger than warranted.
Make the quantifier explicit. Ask: does the speaker mean all, most, many, or some? Then check whether the conclusion follows from the actual quantificational strength.
Pervasive in stereotyping and profiling, in folk wisdom presented as universal truth, in medical reasoning ('elderly patients respond poorly to X'), and in cultural generalisations used in political rhetoric.
Drawing broad conclusions from limited, unrepresentative, or anecdotal evidence.
A formal fallacy where the quantifier in a proposition is suppressed or left ambiguous, allowing the arguer to shift between 'some' and 'all' interpretations as convenient. This exploits the natural language tendency to omit quantifiers.
The error of drawing conclusions about individuals from aggregate (group-level) data. Correlations observed at the group level may not hold at the individual level due to within-group variation, confounding, and aggregation effects. This is the statistical formalization of the ecological fallacy.
Believing individual member characteristics reflect the entire group.
Use these tools to detect, analyze, or train this aspect.