Quotes
Contagious
6 memorable lines from Contagious by Jonah Berger, each with the idea behind it.
“People do not share randomly. They share because the act gives them social currency.”
Berger's sharpest insight is that word-of-mouth is self-interested in a useful way. Make the sharer look good and the message earns a carrier.
“Triggers turn memory into distribution.”
The best ideas are attached to cues people encounter repeatedly: days of the week, meals, commutes, weather, rituals, or phrases already living in the culture.
“High-arousal emotion is the difference between noticing and forwarding.”
Awe, anger, anxiety, delight, and surprise create motion. Mild approval rarely spreads because it does not create enough internal pressure to act.
“If behavior is invisible, imitation has nothing to copy.”
Public signals matter because people learn socially. Make adoption observable and the idea gains proof every time someone uses it.
“Useful information travels because helping someone else feels good.”
Practical value is not just discounting or tips. It is packaging usefulness so the recipient immediately sees who needs it and why now.
“Stories are Trojan horses for ideas.”
A good narrative carries the lesson without making the reteller sound like an ad. The story survives because it is entertaining; the message survives because it is embedded.