The Availability Cascade: Media Influence on Perception

Page Summary

An explainer of the availability cascade, the self-reinforcing process by which a claim's repetition becomes its own perceived evidence, opening with the 1989 Alar apple scare that cost the industry an estimated 250 million dollars despite negligible real risk. Drawing on Kuran and Sunstein's synthesis of the availability heuristic and informational cascades, it walks the four stages (triggering event, social amplification, reputational and informational conformity, policy entrenchment), case studies (Alar, power-line EMF fears, MMR-autism), why expert correction often fails, and policy remedies.

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Every accepted correction to this page is recorded with the exact change, so readers can see how the page improved over time.

1. 11 July 2026 · corrected by Emir Baycan

   The '150 coconut deaths per year' figure is a popular myth with no rigorous basis; it should not be stated as established fact. The shark-deaths point is fine.

   Before

   In reality, falling coconuts kill approximately 150 people per year worldwide; shark attacks kill fewer than ten.

   After

   In reality, the widely repeated claim that falling coconuts kill around 150 people per year worldwide is an unsubstantiated myth, while shark attacks kill fewer than ten.

   Why: The 150-coconut-deaths-per-year figure is a popular myth with no rigorous basis and should not be stated as established fact.

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