That's the question I just did an effort-post in reply to on Quora.
Dustin Wyatt’s answer to What would our world be like if everybody behaved completely rationally? – Quora
It depends on what you mean by rationality.
If you mean some caricature of rationality like Spock, then the world would be a pretty lifeless place. People …
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Getting rid of religion would get us 70% of the way there.
Feel free to vote up my answer while over there!