Stuart_Armstrong comments on Consequences of arbitrage: expected cash - Less Wrong
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Comments (27)
Mainly agree - but don't forget aggregation. You can get rid of risk even if everyone is risk-averse, just by replacing "whole ownership of few risky contracts" with "partial ownership of many risky contracts".
In the example in this post, if I own LH and you own LT, and we are both risk averse, we gain from trading half our contracts to each other.