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As to be furthered below, it seems that the law has gradually changed from absolute contractual obligations, the strict pacta sunt servanda, towards more flexible attitudes, especially in relation to changed circumstances. 1014
With regard to whether courts should intervene to provide relief or require an adjustment in the obligation of performance of a contract when an unforeseen frustrating event occurs, the Modernist camp urges, albeit on differing theoretical bases, that intervention by courts to fill a gap in the parties' agreement is required. The occurrence of a contingency or frustrating event that was unforeseeable at the time of contracting creates circumstances that were not within the contemplation of the parties, and therefore performance exceeds the assent induced and given. Consequently, intervention is required. Economic theory and risk sharing based on "fairness" are two prevailing views on the methodology to be employed by the courts in gap-filling. 1015
Generally speaking, this principle of changed circumstances will be a tool providing more equity than the harsh distinction between "possibility" and "impossibility" of performance of an obligation. 1016 It is to be noted that not all changes in circumstance may affect the contract. Only changes in circumstances which are known or should have been known by both parties to be an assumption upon which the contract is concluded are relevant. It is only if these circumstances no longer exist that the common Basis for the transaction disappears. 1017 Further, an important restriction is to be borne in mind: a change in circumstances will not be taken into account if it occurred during a delay in performance of the person alleging application of the doctrine, this because the principle is based on the "good faith" concept. 1018
At the outset, it is to be clarified that the discussion below will be focused on changed circumstances relating to non-performance rather than invalidity and therefore, for example, initial impossibility will not be studied in this PART. 1019 In this chapter, a brief review is firstly made upon the doctrine underlying the principle of changed circumstances, i.e. rebus sic stantibus. Once this doctrine is examined generally, different approaches to changes of circumstances, nationally or internationally, are to be outlined briefly. Then the two major legal concepts, i.e. force majeure and hardship which are exceptions to the basic rule pacta sunt servanda, dealing with the problem of changed circumstances are to be considered on a general and theoretical basis. Finally, a particular regard will be had to the rights or relieves concerning changed circumstances established under the studied international instruments, namely the CISG, UPICC and PECL.
1014. See Tom Southerington in "Impossibility of Performance and Other Excuses in International Trade": Tuula Ämmälä ed., Publication of the Faculty of Law of the University of Turku, Private law publication series B:55 (2001). Available online at ‹http://www.cisg.law.pace.edu/cisg/biblio/southerington.html›
1015. See Sarah Howard Jenkins in "Exemption for Nonperformance: UCC, CISG, UNIDROIT Principles -- A Comparative Assessment": 72 Tulane Law Review (1998); pp. 2017-2020. Available online at ‹http://www.cisg.law.pace.edu/cisg/biblio/jenkins.html› See also, Joseph M. Perillo: All contracts involve risks. Some contracts are almost purely aleatory. If one sells shares of stock on the stock exchange that one does not have -- the so-called "short sale" -- it is a contract of pure risk and I can conceive no circumstance (absent fraud or the like) in which a court should relieve the seller or buyer from a total loss even if unexpected and unforeseeable events disrupted the market. On the other hand, in the more typical contract involving the sale of goods or services, or the rental of real estate, each party expects to gain from the contract and each party understands that the other party also expects to gain. In such contracts, neither party expects to gain from the other's loss, although both realize that such an imbalance may occur. In the common law, several kinds of events produce an almost automatic excuse for nonperformance: death of a person who is to personally perform, supervening illegality of a performance, and the destruction of the subject matter. When one goes beyond these three categories, relief is most justified if unexpected events inflict a loss on one party and provide a windfall gain for the other or where the excuse would save one party from an unexpected loss while leaving the other party in a position no worse than it would have without the contract. (Infra. note 14, pp. 119-120.)
1016. See Katsumoto, M. in "Kigyo no torihikihippaku to jijohenko no gensoku": NBL No. 55 (1974); p. 9. Impossibility is appropriately seen as an extreme example of changed circumstances.
1017. See van Houtte, Hans in "Changed Circumstances and Pacta Sunt Servanda": Gaillard ed., Transnational Rules in International Commercial Arbitration, ICC Publ. Nr. 480,4, Paris (1993); p. 116. TLDB Document ID: 117300.
1018. See Puelinckx, A.H. in "Frustration, Hardship, Force Majeure, Imprévision, Wegfall der Geschäftsgrundlage, Unmöglichkeit, Changed Circumstances": 3 J.Int'l Arb. No. 2 (1986); p. 64. TLDB Document ID: 128100.
1019. Several classifications of impossibility have been introduced in the literature. Their value would seem to be in distinguishing different kinds of situations from another where the legal consequences of impossibility should be different. Often a distinction has been made between initial (pre-existing, original) and subsequent (intervening) impossibility. Initial impossibility refers to a situation where performance has been impossible already at the moment the contract was concluded, whereas subsequent impossibility refers to situations where performance was initially possible but became impossible after the conclusion of the contract. The division of impossibility into initial and subsequent seems to be useful since different kinds of solutions have been introduced to manage some of these situations. Initial impossibility may, for example, lead to the use of rules related to mistake or perhaps fraud and subsequent impossibility to the rules on frustration. (Supra. note 2.) Both the UNIDROIT Principles and the European Principles deal with such initial impossibility, respectively in Arts. 3.3 and 4:102, but such initial impossibility seems to be more appropriately related to the invalidity of contract caused by the defects of content, which is not covered under the CISG, rather than non-performance issue.
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