Availability Cascade

A self-reinforcing cycle where a belief becomes more plausible through repetition in public discourse—regardless of its truth. A claim is made → media covers it → public discusses it → the discussion makes it feel more real → more media coverage → the claim feels even more established. Availability cascades explain how minor risks become public panics, how false narratives become 'common knowledge,' and how market bubbles form. The mechanism: availability heuristic (frequently mentioned = important/true) + social proof (everyone's talking about it = it must be real) + media incentives (alarming stories get clicks) create a self-amplifying loop.

When to use it

When public concern about a risk seems disproportionate to evidence; when market enthusiasm or panic accelerates faster than fundamentals justify; when 'common knowledge' claims lack identifiable original evidence; when designing communication strategies that might intentionally or accidentally trigger cascades.

How it can help

When evaluating any belief that 'everyone knows': trace it back to evidence rather than prevalence. How many INDEPENDENT sources support this claim versus how many sources are citing each other? Availability cascades are recognizable by their velocity—claims that spread faster than evidence can support them are likely cascading on repetition rather than truth. Defensively: wait for the cascade to settle before making decisions based on it. Offensively: understand that availability cascades are the mechanism behind viral marketing, trend creation, and narrative warfare.