Article 58 - Price determination
(1) Where a contract does not fix or make provision for determining the price, the parties are considered, in the absence of any indication to the contrary, to have made reference to the price generally charged at the time of the conclusion of the contract for such performance in comparable circumstances in the trade concerned or, if no such price is available, to a reasonable price.
(2) Where the price is to be fixed by a third
Person, and that Person cannot or will not do so, the price shall be a reasonable price.
(3) Where the price is to be fixed by reference to factors which do not exist or have ceased to exist or to be accessible, the nearest equivalent factor shall be treated as a substitute.