The overwhelming majority of participants misinterpreted trade as a zero-sum game, where one side inevitably gets the short end of the stick. https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3117627 …pic.twitter.com/fx1rZphYoc
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To take airport pricing example to extreme consider hostage situation. If you pay money for someone's life it is a fair trade, but unlikely this could be called positive sum game
In situations where monopoly at work such as many airports there is no more supply in response to high prices, lots of airports in Russia are example for this
I'd say nonzero sum, not positive. Some trades and systems are negative sum games.
One reason it can exist is human nature being very exploitable, and invisible hand do exploit
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