

STEVEN PINKER: How Common Knowledge and Rationality Make the World Go Round
46 snips Sep 25, 2025
Steven Pinker, a Harvard cognitive scientist and bestselling author, delves into the intricacies of common knowledge and rationality. He explains how the hidden force of common knowledge shapes societal norms and behaviors, influencing everything from financial bubbles to personal relationships. Pinker reveals why smart individuals might still embrace irrational beliefs, highlighting the impact of vivid narratives on decision-making. His insights offer a path to improve societal rationality through education and critical thinking, underscoring the tension between logic and mythological beliefs.
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Common Knowledge Enables Coordination
- Common knowledge is different from private knowledge and requires mutual, recursive awareness to change behavior.
- That shared publicness enables coordination and can transform deference into ridicule or action.
Focal Points Replace Infinite Recursion
- Humans rarely compute infinite recursive beliefs but use a mental shortcut: perceiving something as self-evident or public.
- Focal points and conventions substitute for infinite recursion and solve many coordination problems.
Shared Expectations Drive Markets And Politics
- Many large-scale systems rely on shared expectations, from driving sides to currency and markets.
- Recursive expectations can create bubbles and crashes when doubt or selling becomes common knowledge.