Two human flaws that affect public policy are:
1. Cognitive hubris: each of us believes that his map of the world is more accurate than it really is.
2. Radical ignorance: when it comes to complex social phenomena, our maps are highly inaccurate.
This essay is focused on exploring the causes and consequences of cognitive hubris. Cognitive hubris can explain large, persistent disagreements over such issues as financial regulation and Keynesian fiscal stimulus.
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