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Article 5.1.75 Bibliography (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 determined by one party and that determination is manifestly unreasonable, a reasonable price shall be substituted notwithstanding any contract term to the contrary.
(3) Where the price is to be fixed by one party or a third person, and that party or third person does not do so, the price shall be a reasonable price.
(4) Where the price is to be fixed by ref-erence 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.

Author	Title	Publisher
FERRANTE, A.	A Short Dissertation on the Unidroit Principles and Their Future Perspectives	The European Legal Forum, n.5/2007, pp.214-218.
KLEINHEISTERKAMP, J.	Comment to Content: Art 5.1.7 - Price determination,pp.559-565	in S.VOGENAUER - J.KLEINHEISTERKAMP, Commentary on the UNIDROIT Principles of International Commercial Contracts (PICC),Oxford University Press, New York, 2009
MARRELLA. F.	Contratti di vendita internazionale privi di prezzo, questione preliminare e Principi UNIDROIT	Rivista dell"arbitrato 2002, 129-138
VOGENAUER, S.	Comment on Arts. 5.1.1-5.1.9	in S. VOGENAUER (ed.), Commentary on the UNIDROIT Principles of International Commercial Contracts (PICC), 2nd ed., Oxford University Press, Oxford, 2015, 617-653
VOGENAUER, S.	Comment to Content: Arts 5.1.1-5.1.9,pp.541-576	in S.VOGENAUER - J.KLEINHEISTERKAMP, Commentary on the UNIDROIT Principles of International Commercial Contracts (PICC),Oxford University Press, New York, 2009