OPINION OF THE COURT
Nоrfolk Southern Railway Co. (“Norfolk Southern”) and its customer Basell USA Inc. (“Basell”) agree that Basell breached a contract that existed between them. They disagree, however, as to whether the breach was material and whether it constituted a repudiation — either of which would have entitled Norfolk Southern to terminate the contract. On cross-summary judgment motions, the District Court held that Norfolk Southern did not have the right to terminate the contract, explicitly concluding that the breach was not material and implicitly ruling that there had been no repudiation. Norfolk Southern now appeals both of these aspects of the District Court’s order. The District Court had jurisdiction pursuant to 28 U.S.C. § 1332 and we have jurisdiction pursuant to 28 U.S.C. § 1291. We will vacate the District Court’s summary judgment order in part and remand for further proceedings consistent with this opinion.
I. Factual and Procedural History
Basell manufactures plastic pellets at a production facility in West Lake Charles, Louisiana, and contracts with others, including Norfolk Southern, to transport those pellets to customers throughout the United States. There is no single rail carrier that can offer freight transport all the way from the West Lake Charles facility to destinations in the eastern United States. The BNSF Railway Company (“BNSF”) and the Union Pacific Railroad (“Union Pacific”) both serve West Lake *89 Charles, but do not serve destinations in the eastern United States. Conversely, Norfolk Southern and CSX Transportation Company (“CSX”) both serve destinations in the eastern United States, but do not serve West Lake Charles. Therefore, all rail deliveries to the eastern United States are by joint-line service, involving both an origin carrier and a destination carrier— either BNSF or Union Pacific transports the pellets from the West Lake Charles facility to a rail “interchange,” where it hands off the railcars to either Norfolk Southern or CSX for the second leg of the trip.
This pellet-transport traffic divides into three categories:
• “Competitive rail direct”: both Norfolk Southern and CSX are capable of transporting the pellets all the way from the rail interchange to the end customer by rail.
• “Captive rail direct”: only Norfolk Southern or CSX is capable of transporting the pellets all the way from the rail interchange to the end customer by rail.
• “Truck terminal”: the end customer either must receive, or prefers to receive, the pellet delivery by truck instead of by rail; either Norfolk Southern or CSX transports the pellets from the rail interchange to a terminal, where it then transfers them to trucks for final delivery.
Norfolk Southern and Basell entered intо a contract in early 2002 under which Norfolk Southern promised to charge Ba-sell a rate below the published tariff rate in exchange for Basell’s using Norfolk Southern for 95% of certain deliveries originating in West Lake Charles from February 2002 through May 2007. 1 According to Basell, the minimum volume commitment was 95% of the aggregate deliveries — competitive rail direct, captive rail direct, and truck terminal — that Norfolk Southern was capable of making, excluding any truck deliveries where the end customer was more than 100 miles from the nearest Norfolk Southern truck-transfer terminal. According to Norfolk Southern, the minimum volume commitment was 95% оf the aggregate competitive and captive rail direct deliveries that it was capable of making, and also 95% of the truck deliveries where the end customer was less than 100 miles from the nearest Norfolk Southern truck-transfer terminal. 2
Basell fulfilled its minimum volume commitment in 2002, 2003, and 2004. However, it fell short in 2005 when it entered into a contract obligating it to use CSX for shipments originating in West Lake Charles. Basell’s expert calculated that in 2005 Basell used Norfolk Southern to deliver 80% of the traffic covered by their contract, instead of the promised 95%. The 15% shortfall consisted entirely of rail direct traffic — captive and competitivе— and not a single truck terminal delivery.
Norfolk Southern does not dispute the 80% figure, but emphasizes that, in breaching the contract, Basell provided it with only 55% of the competitive rail direct traffic, and that this number is the proper focus for determining the magnitude of the breach. Norfolk Southern urges that it agreed to charge Basell discounted rates across the board — including for captive traffic — in order to secure the competitive traffic originating in West Lake Charles, *90 for which Basell could have chosen to use either Norfolk Southern or CSX. Since Basell would have received the captive traffic even without the contract, it maintains that the diverted competitive traffic is what is most relevant in evaluating the breach.
Basell entered into a two-year contract with CSX beginning in February 2005. It is undisputed that compliance with its contractual obligations to CSX caused its failure to meet its minimum volume commitment to Norfolk Southern. Although the details of Basell’s contract with CSX are not clearly set forth in the record before us, 3 the parties agree that Basell promised to use CSX as the destination carrier for 95% of a pool of deliveries that overlapped somewhat with the pool of West Lake Charles deliveries covered by Basell’s contract with Norfolk Southern. In order to fulfill its minimum volume commitment to CSX, Basell diverted to CSX сompetitive rail direct traffic for which it was already contractually bound to use Norfolk Southern.
The procedural history of the case as it progressed in the District Court is somewhat complex, with a variety of claims and counterclaims asserted along the way. Originally, Norfolk Southern sued for (1) a declaratory judgment that Basell should have been paying the tariff rate for all transport services that Norfolk Southern had provided it since June 2002, which included deliveries originating in West Lake Charles and three other Basell pellet-production facilities, and (2) money damages for Basell’s failure to pay the tariff rate. Norfolk Southern then amended its complaint to add a claim for breach of contract. Basell filed counterclaims for a declaratory judgment in its favor, quantum meruit, unfair competition, and tor-tious interference with existing and prospective contractual relations. It appears from the record that it was not until roughly two months before the bench trial that Norfolk Southern learned of Basell’s contract with CSX, during the deposition of Samuel Slovak, a Basell employee responsible for transportation procurement. Less than one month before trial, in a stipulation filed with the District Court, Norfolk Southern withdrew its original two counts and Basell withdrew its quantum meruit counterclaim. Less than one week before trial, Norfolk Southern notified the Court and Basell for the first time of two key changes in its litigation strategy: first, it was no longer pursuing any claim related to pellet-production facilities other than West Lake Charles and, second, it was now asserting that Basell’s breach of the parties’ West Lake Charles contract was material and that, therefore, Norfolk Southern could treat that contract as terminated. However, with the parties in agreement that there was a West Lake Charles contract and that Basеll had breached it, the District Court did not concern itself with the state of the pleadings and ordered cross-summary judgment motions.
The issues before the District Court on summary judgment centered on whether Norfolk Southern should be permitted to terminate the contract and, if not, whether the proper remedy for the breach was lost profits or liquidated damages. Norfolk Southern argued that contract termination was appropriate because Basell materially breached and/or repudiated its contract with Norfolk Southern by entering into the February 2005 contract with CSX. This was the first time that Norfolk Southern *91 raised the issue of repudiation. 4
The District Court concluded that Ba-sell’s breach was not material and that, therefore, Norfolk Southern could not terminate its contract with Basell; it did not address Norfolk Southern’s repudiation argument. However, the Court determined that there was an immaterial breach and that the appropriate remedy was measured by lost profits. It awarded Norfolk Southern $270,430 for lost profits incurred through June 2006, which was the estimate of lost profits that Basell had submitted to the Court as part of its motion for summary judgment; Norfolk Southern’s estimate had been $258,080. The Court found the estimates to be “strikingly similar” and chose the higher of the two, without explanation.
Norfolk S. Ry. Co. v. Basell USA, Inc.,
No. 05-3419,
Norfolk Southern continues to seek a ruling that it is entitled to terminate the contract because Basell’s breach was material, or, alternatively, because Basell’s conduct amounted to a repudiation. Norfolk Southern urges that under either scenario it would then be entitled to recover — as restitution — the difference between the tariff rate and the discounted rate for all deliveries originating in West Lakе Charles that it made for Basell after Basell entered into its conflicting contract with CSX.
II. Analysis
Our review of the District Court’s grant or denial of summary judgment is plenary, and we apply the same standard that the District Court applied in determining whether summary judgment was appropriate.
Abramson v. William Paterson Coll. of N.J.,
As a federal court sitting in diversity, we “are required to apply the substantive law of the state whose laws govern the action,”
Robertson v. Allied Signal,
A. Material Breach
For a breach to be material, it must “go[ ] to the essence of the contract.”
Gen. Motors Corp. v. New A.C. Chevrolet, Inc.,
(a) the extent to which the injured party will be deprived of the benefit which he reasonably expected;
(b) the extent to which the injured party can be adequately compensated for the part of that benefit of which he will be deprived;
(c) the extent tо which the party failing to perform or to offer to perform will suffer forfeiture;
(d) the likelihood that the party failing to perform or to offer to perform will cure his failure, taking account of all the circumstances including any reasonable assurances;
(e) the extent to which the behavior of the party failing to perform or to offer to perform comports with standards of good faith and fair dealing.
Restatement (Second) of Contracts § 241 (1981). These materiality factors are “to be applied in the light of the facts of each case in such a way as to further the purpose of securing for each party his expectation of аn exchange of performances.” Id. § 241 emt a. No single factor is disposi-tive.
Whether the breach of a contract is material is generally an issue of fact.
Saienni v. G & C Capital Group, Inc.,
No. 96C-07-151,
The District Court correctly identified the
Restatement
factors, but, we conclude, erred in concluding thаt “no reasonable fact finder could find that Basell’s breach of its volume commitment is a material breach.”
Norfolk S. Ry. Co. v. Basell USA, Inc.,
No. 05-3419,
Before applying the first Restatement factor, which focuses on the deprivation of the “benefit” bargained for, it is helpful to consider how both the customer and the supplier benefit from a requirements contract like the one between Basell and Norfolk Southern. The customer “gets the assurance of a source of supply” for a particular good or service, perhaps for a fixed price, without having to commit ahead of time to purchasing a fixed quantity of that good or service. 2 Joseph M. Perillo & Helen Hadjiyannakis Bender, Corbin on Contracts § 6.5 (Rev. Ed.1995). The supplier benefits, even though the actual amount of business that it will receive under the contract is uncertain, because it “locks in a customer” for a set percentage (if not all) of whatever quantity the customer ends up requiring. Id. Here, the percentage was 95% of Basell’s shipments.
Regarding the first factor, the District Court found that, “[ajlong with three years of full performance, the fact that Basell’s shortfall is only 15% underscores the limited extent to which Norfolk Southern has been deprived of the benefit it reasonably expected from the contract.”
Norfolk S. Ry. Co.,
The
Restatement
explains that the second factor — the extent to which the non-breаching party can be adequately compensated for the loss of benefit — “is a corollary of the first” and that “[difficulty ... in proving with sufficient certainty the amount of that loss will affect the adequacy of compensation.”
Restatement (Second) of Contracts
§ 241 cmt c. The District Court found this factor to be the most significant and determined that “Norfolk can be adequately compensated for Ba-sell’s breach because Norfolk’s present damages are readily calculable.”
Norfolk S. Ry. Co.,
The third factor is the extent to which the breaching party will suffer forfeiture if the non-breaching party is permitted not to perform. In elucidating this factor, the
Restatement
explains that there is a risk of forfeiture when the breaching party “has relied substantially on the expectation of the exchange, as through preparation or performance.”
Restatement (Second) of Contracts
§ 241 cmt d. Therefore, as the District Court noted in its brief apparent reference to forfeiture, a breach is “less likely to be regarded as material if it occurs late, after substantial preparation or performance.”
Id.; see Norfolk S. Ry. Co.,
As for the fourth factor — the likelihood of cure by the breaching party — the District Court emphasized that “although Ba-sell does not promise that it will not breach the contract going forward, Basell states that ‘it is not a foregone conclusion that Basell will not meet the minimum volume commitment in 2006’ and ‘[t]here could very well be no shortfall in 2007.’ ”
Norfolk S. Ry. Co.,
The District Court referred to the fifth and final factor — that is, the extent to which the breaching party’s behavior comported with standards of good faith and fair dealing — only briefly, stating that “the Court does not accept Norfolk’s characterization of the breach, namely that Basell’s business decision, driven by operational needs, amounted to a spiteful ‘slap in the face’ to Norfolk.”
Norfolk S. Ry. Co.,
Taking all of the factors together, we find that, on balance, they tilt instead in Norfolk Southern’s favor when viewed through the pro-Norfolk Southern lens of summary judgment. Therefore, a reasonable fact finder could conclude that, under the Restatement factors, the breach was material. The District Court thus erred in deciding on summary judgment that Basell did not materially breach its contract with Norfolk Southern.
Wе wish to make clear, however, that we do not hold that the District Court instead *96 should have found on summary judgment that the breach was material. Just as a reasonable fact finder could conclude that the breach was material, a reasonable fact finder could conclude — as the District Court did — that the breach was not material. Reasonable minds could differ and summary judgment is, therefore, not the appropriate way to resolve the issues presented in this case.
In addition, we note that, although it is not impossible, determining whether a breach is material on summary judgment is inherently problematic where, as here, the materiality analysis may well turn on subjective assessments as to the state of mind of the respective parties. As we have emphasized in the past, “a court should be reluctant to grant a motion for summary judgment when resolution of the dispositive issue requires a determination of state of mind, for in such cases much depends upon the credibility of witnesses testifying as to their own states of mind, and assessing credibility is a delicate matter best left to the fact finder.”
Metzger v. Osbeck,
B. Repudiation
As we noted above, Norfolk Southern sought an alternative holding from the District Court that Basell’s conduct amounted to a repudiation, and that it could, therefore, terminate the contract and recover the full tariff rate for all deliveries originating in West Lake Charles made after Basell entered into its contract with CSX.
The Restatement defines a repudiation as
(a) a statement by the obligor to the obligee indicating that the obligor will commit a breach that would of itself give the obligee a claim for damages for total breach under § 243, or
(b) a voluntary affirmative aсt which renders the obligor unable or apparently unable to perform without such a breach.
Restatement (Second) of Contracts § 250. The illustrations included with this section of the Restatement indicate that entering into a conflicting contract can satisfy the second prong of the definition. Id. illus. 1, 5 (“On April 1, A contracts to sell and B to buy land, delivery of the deed and payment of the price to be on July 30 ..., A says nothing to B on May 1, but on that date he contracts to sell the land to C. A’s making of the contract with C is a repudiation.”) Like material breach, repudiation by one party to a contract entitles the other party to terminate that contract. Id. § 253.
The Delaware Supreme Court endorsed the first prong of the
Restatement’s
definition in a case where one party’s
statement
allegedly constituted a repudiation.
CitiSteel USA, Inc. v. Connell Ltd. P’ship,
The District Court did not directly address Norfolk Southern’s contention that, by entering into the February 2005 contract with CSX, Basell had repudiated its contract with Norfolk Southern under the conduct prong of the
Restatement’s
definition. At most, the Court alluded to the issue in its discussion of material breach, when it found that it was not a “foregone conclusion” that Basell would breach its contract with Norfolk Southern in 2006.
See Norfolk S. Ry. Co.,
A district court’s failure to consider an issue below does not necessarily preclude us from addressing it on appeal.
Hudson United Bank v. LiTenda Mortgage Corp.,
Here, the record is not sufficiently developed for us to consider the merits of the parties’ аrguments as to repudiation. Norfolk Southern contends that the CSX contract rendered Basell either “unable or apparently unable” to fulfill its pre-existing contractual obligations to Norfolk Southern, maintaining that Basell agreed to use CSX for at least 95% of the same traffic that had already been promised to Norfolk Southern. Basell counters that its contract with CSX covered only some of the same traffic as its contract with Norfolk Southern, and that fulfillment of both was theoretically possible, depending on the “ebb and flow” of the marketplace. Although it is undisputed that Basell’s CSX contract ended up causing its fаilure to meet its 2005 minimum volume commitment to Norfolk Southern, the current record does not reveal whether this was inevitable, or apparent, from the start. It remains unclear what traffic ■ Basell had promised to CSX, and this information is crucial for an evaluation of Norfolk Southern’s repudiation argument. Without knowing with greater specificity what Ba-sell’s CSX contract required, it is impossible to determine as a matter of law whether entering into that contract rendered Basell unable or apparently unable to fulfill its contract with Norfolk Southern. Norfolk Southern seems to have learned of the CSX contract only two months before the Court ordered cross-summary judgment motions, and the record is still too sparse regarding that contract’s details for us to rule on the issue. Therefore, we will leave this issue for the District Court to decide on remand after further factual development. 8
III. Conclusion
For these reasons, we will VACATE the District Court’s summary judgment order *98 insofar as it concluded, explicitly, that the breach was not material and, implicitly, that there was no repudiation. 9 We will REMAND for further proceedings consistent with this opinion.
Notes
. Although the parties disagree slightly as to the type of traffic that was to be included in the formula, the discrepancy does not have a significant effect on our analysis because they agree that rail direct was included and the vast majority of the West Lake Charles traffic was rail direct.
. There is no final written contract.
. We do not have a final written contract between Basell and CSX, just as we have no final written contract between Basell and Norfolk Southern.
. The issue of Norfolk Southern’s potential waiver of its contract termination, material breach, and repudiation theories by failing to plead them has not been raised on appeal.
. Neither party is challenging the District Court’s determination that $270,430 was the proper measure of Norfolk Southern’s lost profits through the end of June 2006.
.The District Court found that Delaware law governs this action,
Norfolk S. Ry. Co. v. Basell,
. We do not believe that the Delaware Superi- or Court’s decision in
SLMSoft.Com, Inc.,
. Similarly, we will not address the issue as to whether, and to what extent, Norfolk Southern would be entitled to restitution if the District Court finds a material breach or repudiation. We leave that for the District Court to determine in the first instance.
. Insofar as the District Court’s award of damages for lost profits based on an immaterial breach is not challenged on appeal, that aspect of its ruling is not vacated but would control should it determine on remand that Basell did not materially breach or repudiate its contract with Norfolk Southern.
