https://en.wikipedia.org/wiki/Myerson%E2%80%93Satterthwaite_theorem
Mechanism design issue caused by information assymetry.
It poses that there is no efficient way to trade a good between two parties that have assymetrical information on the value of the good.
From wikipedia: “Informally, the result says that there is no efficient way for two parties to trade a good when they each have secret and probabilistically varying valuations for it, without the risk of forcing one party to trade at a loss.”