| ||1. Amount of harm presumed in case of replacement transaction
It seems advisable to establish, alongside the general rules appli¬cable to the proof of the existence and of the amount of the harm, presumptions which may facilitate the task of the aggrieved party.
The first of these presumptions is provided by this Article which corresponds in substance to Article 75 CISG. It concerns the situation where the aggrieved party has made a replacement transaction, for instance because so required by the duty to mitigate harm or in conformity with usages. In such cases, the harm is considered to be the difference between the contract price and the price of the replacement transaction.
The presumption comes into play only if there is a replacement transaction and not where the aggrieved party has itself performed the obligation which lay upon the non-performing party (for example when a shipowner itself carries out the repairs to its vessel following the failure to do so of the shipyard which had been entrusted with the work).
Nor is there replacement, and the general rules will apply, when a company, after the termination of a contract, uses its equipment for the performance of another contract which it could have performed at the same time as the first (“lost volume”).
The replacement transaction must be performed within a reasonable time and in a reasonable manner so as to avoid the non-performing party being prejudiced by hasty or malicious conduct.
2. Further damages recoverable for additional harm
The rule that the aggrieved party may recover the difference between the two contract prices establishes a minimum right of recovery. The aggrieved party may also obtain damages for additional harm which it may have sustained.
A, a shipyard, undertakes to accommodate a ship belonging to B, a shipowner, in dry dock for repairs costing USD 500,000 as from 1 July. B learns on 1 June that the dry dock will only be available as from 1 August. B terminates the contract and after lengthy and costly negotiations concludes with C, another shipyard, an identical contract at a price of USD 700,000. B is entitled to recover from A not only the difference in the price of USD 200,000 but also the expenses it has incurred and compensation for the longer period of unavailability of the ship.