Availability Cascade

Two components

Marc Andreessen uses a framework from a paper by Timur Kuran, known for work on preference falsification, and Cass Sunstein to explain the mechanism behind viral outrage cycles.¹

Availability bias is the cognitive tendency to overfocus on whatever is presently in view, regardless of whether it is proportionally important next to everything not being focused on. A cascade is a sociological term for an idea or movement that builds momentum as it spreads through a social network, where each new participant increases the credibility and visibility of the next. An availability cascade combines the two: availability bias gets deliberately triggered and then cascades through society, building to a peak of focused collective attention before decaying.

The availability entrepreneur

Every significant availability cascade, traced back, has an availability entrepreneur: a person or organization that deliberately identifies what the public should be focused on right now and seeds the cascade. The entrepreneur's job is not to be the cascade, it is to start it, by finding the triggering event and injecting it into public consciousness with enough force to become the current thing.

The canonical example is Rosa Parks. The standard telling is that an ordinary person spontaneously refused to give up her bus seat and triggered the Montgomery Bus Boycott and, eventually, the Civil Rights Act. The fuller story is that Parks was a trained activist who had attended the Highlander Folk School, and the bus incident was a deliberately selected op: organizers had been looking for the right triggering circumstances to seed a mass cascade. Andreessen's point about what that fact means: "oh, that's just an op is basically cope." Once an op seeds a genuine mass movement, the starting mechanism becomes irrelevant to the outcome; there is no meaningful distinction between an organic and an op-seeded movement that achieve the same ends. The entrepreneur's goal is always to become unnecessary, to start the op, seed the cascade, and then watch it become real.¹

What makes a cascade take hold

For a cascade to self-propagate rather than fail as an op, four conditions tend to be present. There must be resonance in pre-existing sentiment, since the trigger does not create the underlying feeling, only a focal point for it. The event must be personalized and concrete, a specific person harmed rather than an abstract statistic: in the formulation attributed to Stalin, a single death is a tragedy and a million deaths are a statistic, and small-scale, vivid harms out-cascade large-scale ones. Ambiguity about the truth of the triggering event is an advantage rather than a weakness, since it is harder to refute and longer-lasting as a live argument. And the event must activate opposing moral tribes, since the conflict between them is the cascade's energy source.¹

A related structural bias shows up in viral video, a pattern the Rodney King footage set: recording tends to start only once an event becomes interesting enough to capture, which is precisely when the context-setting runup is already over, so the public sees the emotionally intense moment without the events that preceded it.¹

The legal gap

In the United States, paying an influencer to say a product is good requires disclosure under advertising law, and donating to a political candidate requires disclosure under election law. Paying influencers to take positions on moral or political issues that are neither a product nor a candidate requires no disclosure and is fully legal. That gap makes availability entrepreneurship around social and political issues a legal dark-money channel. Andreessen names a live instance: nonprofit-funded influencer fellowships that pay people to produce AI-doom content, funded by donors who need not be disclosed because the output is neither a product ad nor a political donation.¹