The conjunction fallacy works only when a description matches perceived group stereotypes.

Evidence

We capitalized on a classic judgment task that has been widely used by researchers. … Most participants given this question choose option 2. However, the second option is necessarily less probable than the first. This problem works only because, at an intuitive level, the description of Linda just sounds like a description of an active feminist. This is termed the representativeness heuristic—judging the probability of events based on perceived representativeness to a description, rather than based on consideration of probabilities. Crucially, this effect works only if the description of the target (liberal and focused on issues of discrimination) matches the potential group membership of the target (feminist). — Norenzayan, Ara, Big gods - how religion transformed…, 273

Categorization

• DEFINE: Explains the representativeness heuristic and the conjunction-fallacy logic, which is load-bearing for the atheist-distrust study it enables.