Right, I'm operating on the premise that the AD "pays" Main Hall. What I'm saying is that it doesn't cost UM
as a whole significant money. AD pays, MH receives. OR, AD doesn't pay (receives), MH doesn't receive (pays). If UM added up all the pennies in all of its accounts, the balance would be the same. Which is why I suggested, if it's a problem for Peter (AD) to "pay" Paul (MH), they could find a different way to trade money within their joint checking account given that the conference revenue would be higher.