dosłownie - ceny rynkowej
Słownik Jaślanów - str. 216

contract-cover and contract-market price differential

zabezpieczenie umowne i
różnica między ceną umowną a rynkową

Tak chyba powinno być.

§ 2-713. Buyer's Damages for Non-delivery or Repudiation.

(1) Subject to the provisions of this Article with respect to proof of market price (Section 2-723), the measure of damages for non-delivery or repudiation by the seller is the difference between the market price at the time when the buyer learned of the breach and the contract price together with any incidental and consequential damages provided in this Article (Section 2-715), but less expenses saved in consequence of the seller's breach.

(2)Market price is to be determined as of the place for tender or, in cases of rejection after arrival or revocation of acceptance, as of the place of arrival.
https://www.law.cornell.edu/ucc/2/2-713

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Note added at 22 hrs (2019-11-26 16:39:34 GMT)
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C. Computation of Damages

Although we agree that the district court properly concluded that TTS violated the contract, we remain uncertain as to the time of breach and disagree with the court's computation of damages.

The rules for measuring damages are very simple. When a seller breaches the contract, the buyer has two possible remedies. First, he may attempt to cover and obtain goods in substitution for those due from the seller. See Cal.Com.Code Ann. § 2711(1)(a) (West 1964).3 If he covers, he can recover the difference between the cost of cover and the contract price together with any incidental or consequential damages. Id. § 2712(2). Consequential damages are those damages which did not arise within the scope of RBM's transactions with TTS, but which stemmed in a foreseeable way from losses incurred by RBM as a result of TTS's breach. Id. § 2715(2)(a). The profits that RBM lost from its resale of the refurbished trailers are one form of consequential damages. See Milgard Tempering, Inc. v. Selas Corp. of America, 902 F.2d 703, 710-11 (9th Cir.1990) (awarding consequential damages in the form of lost profits where the buyer was unable to produce up to capacity as a result of the faulty performance of the purchased equipment); Dura-Wood Treating Co. v. Century Forest Indus., Inc., 675 F.2d 745, 755 (5th Cir.1982) (recognizing as a general proposition that consequential damages include the lost profits from a buyer's dealings with a third party), cert. denied, 459 U.S. 865, 103 S.Ct. 144, 74 L.Ed.2d 122 (1982).

The buyer's second remedy is to recover the difference between the market price and the contract price. Id. § 2711(1)(b), 2713(1). In this case the contract-market price differential is the difference between the market price of the unmodified trailers TTS agreed to provide RBM and the contract price of those trailers. The buyer can also recover consequential damages under this second remedy but only if they could not have been reasonably prevented by cover or otherwise. Id. § 2715(2)(a). If a buyer could have covered, but chose not to do so, then he cannot recover consequential damages. The buyer would only be allowed to recover the contract-market price differential.
https://law.resource.org/pub/us/case/reporter/F2/945/945.F2d...

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Note added at 22 hrs (2019-11-26 16:45:53 GMT)
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So I read it as follows: the contract-market price differential is the difference between the market price of the goods agreed to provide to the Buyers and the contract price of the said goods at the time of breach by the Sellers.