The amount of money that changes hands in a purchase.
(=> (And (Currency-Transferred ?Buy ?Price) (Object-Sold ?Buy ?Prod))
(List-Price ?Prod ?Price))
(=> (And (List-Price ?Prod ?Price) (Object-Sold ?Buy ?Prod))
(Currency-Transferred ?Buy ?Price))
(=> (And (Currency-Transferred ?Buy ?Price) (Object-Sold ?Buy ?Prod))
(List-Price ?Prod ?Price))
(=> (And (List-Price ?Prod ?Price) (Object-Sold ?Buy ?Prod))
(Currency-Transferred ?Buy ?Price))
(=> (Currency-Transferred $X $Y) (Currency-Quantity $Y))
(=> (Currency-Transferred $X $Y) (Purchasing-Agreement $X))