# 49. Manipulation of bias and heuristics in decision making ## 49.5. Methodology/Refinements/Sub-species ### 49.5.4. Availability cascade This is a self-reinforcing tendency in which a collective belief gains more and more plausibility through its increasing repetition in public discourse (or "repeat something long enough and it will become true"). A manipulator can use continuous repetition of a theme or belief to increase plausibility.