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Contagious: Why Things Catch On

Why This Book Matters

In an age where organic reach is increasingly difficult to achieve, understanding the psychology of sharing is essential. Jonah Berger distills years of research into six principles that make content contagious.

The Core Idea

Berger challenges the assumption that virality is random or unpredictable. Through rigorous academic research, he identifies the STEPPS framework—six key drivers that determine whether ideas, products, and stories spread: Social Currency, Triggers, Emotion, Public, Practical Value, and Stories.

"Word of mouth is the primary factor behind 20 to 50 percent of all purchasing decisions."

Jonah Berger

Key Takeaways

  • Social Currency — People share things that make them look good.
  • Triggers — Top of mind means tip of tongue. Link your brand to everyday cues.
  • Emotion — When we care, we share. High-arousal emotions drive sharing.
  • Stories as Vessels — Embed your brand message in narratives people want to retell.

How It Influences My Work

The STEPPS framework has become invaluable for developing campaigns that earn attention rather than buy it. For luxury brands, where exclusivity and aspiration are paramount, the Social Currency principle is particularly relevant.