Information Cascades

“Several matching choices can make you ignore information you have that other people cannot see.”

01 / PLAINLY

What it means, plainly

An information cascade appears when earlier decisions lead someone to follow the group and stop using information they hold that other people do not know.

02 / CONTEXT

A little more

An information cascade occurs when earlier actions lead rational participants to follow the group and stop using private information. It may grow from little independent evidence and break after one strong public signal.

03 / WHY IT MATTERS

Why it matters

Many matching choices may rest on only a few independent sources and look like stronger evidence than they are.

04 / EXAMPLE

A familiar example

Two diners enter a restaurant on private signals; later arrivals see the line and choose without knowing those signals.

05 / LIMIT

What it does not mean

Following a cascade does not imply stupidity or show that every fad works this way.

06 / NOTICE

Notice it in your day

Imagine a line formed after two initial choices. Separate the number of people you observe from the independent signals that started the line.

FINAL NOTE

The idea worth keeping

Separate the number of observed decisions from the independent sources that produced them.

QUESTIONS / 02

Questions people still have

Why might a rational person follow a cascade?

Earlier actions may seem to carry enough information to outweigh what that person knows independently and others cannot see.

Is an information cascade necessarily stable?

No. It may grow from little evidence and break after a strong public signal.