In a financial market where all agents are rational, no trading would ever happen because either you don't know something that seller knows while buying or buyer doesn't know what you know So the fact that trading happens is a proof of irrationality in financial markets.
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You give me a coffee in exchange for $1 not because you have insufficient insight into the future value of US currency but because you've architected your life such that you prefer $1 to having an extra cup of coffee at virtually all the margins.
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Similarly, w/r/t financial instruments, we might have different: * risk tolerances * other positions / circumstances dictating the trade (buyers/sellers of e.g. options are not necessarily symmetric; hedgers and speculators can make great counterparties) * time horizons * etc
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