//The claim being made is that there are situations which are unambiguously not zero sum.//

I don't disagree with that claim.

//You haven't addressed that.//

A man called Nick Clegg recently took the advice of the author and acted against his zero-sum bias and decided to work with a leader from an opposition political party in a coalition government.

The outcome was positive-sum for Nick Clegg because he got to be Deputy Prime Minister, and for David Cameron because he got to be Prime Minister.

However, a lot of Liberal Democrat and Conservative voters (who as a group were represented by the two party leaders) got angry because they thought the situation of who should govern Britain was a zero-sum contest.

In this situation should the group have overcome its supposed zero-sum bias and urged the leaders to cooperate? Or perhaps they were right in their protests that it was a zero-sum situation, as the leadership deal, which is neither Conservative or Liberal, may turn out to be entirely self-serving for the careers of the two young party leaders and bad for Britain.

The proposed advice is not of use to this real world application.

//It may help for you to read the Sequences. No one is claiming that one should act like something is not zero sum when it is. Dealing with a cognitive bias is not accomplished by doing everything the exact opposite of what that bias would push you towards. Reversed stupidity is not intelligence. Fighting a cognitive bias doesn't mean assuming the exact opposite. It means being aware of the bias and being alert for when the bias may be influencing judgment.//

I'll take time to do so. I'm attracted to Bayesianism but I feel all this fighting business is getting away from science.

//Also, is it possible, if you please, to work a tiny bit on your grammar and punctuation?//

Capitals are back. I'll take the hit for the grammar and punctuation.