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Knowledge is not enough, common knowledge is key
The key insight is that it is not sufficient to know something; one must also be aware that others know the same thing. This concept of common knowledge was exemplified during a debate night when ideas became widely known and everyone had to acknowledge them. Holding a position becomes costless when it is common knowledge, similar to the value of free speech, which is essential for those with opposing views. Common knowledge is crucial for individuals to take a position as it carries weight when others share the same understanding.