| Summary: | The purpose of the present study is to establish a relationship between the unpredictability theory and the contractual liability, from both theoretical and practical point of view. Usually, the unpredictability is invoked by way of defense by the debtor, refusing to perform the excessively onerous obligation. However the unpredictability theory shall apply also to the hypothesis of a performed obligation, by way of main action, depending on more factors: the nature of the agreement, investigating the attitude of the party affected by the unpredictability. Observing the conditions and the effects of these two ways of invoking the unpredictability will form the objectives of the present study.The debtor of the excessively onerous, in order to avoid the contractual liability, shall nevertheless perform such obligation, by carrying along some additional costs. If subsequently, the creditor shall refuse to revise the agreement and implicitly, to reimburse the exorbitant costs, the debtor will have to raise the unpredictability by way of action, in order to recover the exorbitant costs in performing the obligation. In such case, the unpredictability is accompanied by another legal issue: the contractual liability of the co-contractor of the party affected by unpredictability.
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