Remoteness and mitigation

Remoteness and mitigation are the two principal control devices by which the law confines the damages recoverable for breach of contract. Week 13 established the compensatory aims of contractual damages: expectation protects the value of the promised performance, while reliance may be used where the expectation measure is difficult or inappropriate. Week 14 asks a different question. Even if a claimant proves breach, causation and loss, how far does the defendant’s responsibility extend?

The answer is not that every factual consequence of breach is recoverable. Contractual liability is liability for failure to perform an undertaking voluntarily assumed. The law therefore asks whether the loss falls within the kind of risk which, viewed at the time of contracting, was sufficiently within the parties’ contemplation. That is the province of remoteness. Its classical statement is Hadley v Baxendale: recoverable loss is loss arising naturally, in the usual course of things, or loss within the reasonable contemplation of both parties because of special circumstances communicated at the time of contract. Later authorities refine rather than abandon that proposition. Victoria Laundry emphasises reasonable foreseeability and distinguishes ordinary lost profits from exceptional profits. The Heron II insists that contract remoteness is narrower than tort: it is not enough that a loss was merely foreseeable as a real possibility; it must be not unlikely, liable to result, or sufficiently probable in the contractual context. The Achilleas adds a further language of assumption of responsibility, particularly where market understanding indicates that the promisor should not be taken to have accepted liability for the loss claimed.

Mitigation is different. It does not ask what risks the defendant undertook at formation. It asks what the claimant did, or reasonably ought to have done, after breach. The claimant cannot recover avoidable loss caused by an unreasonable failure to act. Nor can the claimant recover expenditure which was unreasonably incurred in responding to breach. Conversely, where reasonable mitigation succeeds, the claimant gives credit for the benefit; where reasonable mitigation fails, the defendant remains liable for the loss, including reasonable mitigation costs. The language of a claimant’s duty to mitigate is conventional but misleading. It is not a duty owed to the contract-breaker. The claimant commits no wrong by doing nothing. The practical consequence is evidential and remedial: damages are reduced because avoidable loss is not treated as legally recoverable.

For Durham first-year Contract, this topic sits at the end of the compulsory private-law sequence for a reason. It requires students to integrate agreement, terms, breach, causation, damages and commercial context. The best answers do not recite Hadley mechanically. They identify the precise type of loss, the time at which knowledge is assessed, the information available to both parties, the market background, and the claimant’s conduct after breach. In problem questions, a disciplined answer normally proceeds in this order: breach; compensatory measure; causation; remoteness; mitigation; quantification. In essays, the strongest answers treat remoteness and mitigation as expressions of a deeper idea: contractual damages compensate, but only for losses which the law regards as within the promisor’s contractual responsibility and not attributable to the claimant’s unreasonable response.

The modern law begins with Hadley v Baxendale in 1854, but the problem it addressed is older than that case. Early common law damages often depended on broad jury assessment. As commerce expanded, courts required more predictable rules for allocating consequential loss. A party in breach could not sensibly be liable for every financial consequence radiating from non-performance. Equally, a claimant who had genuinely lost the value of a promised performance required more than nominal damages. Hadley supplied the canonical compromise.

The facts of Hadley were commercially simple. Millers contracted with carriers to deliver a broken crankshaft to engineers, so that a replacement could be made. Delivery was delayed. The mill stood idle, and the claimants sought lost profits for the period of delay. The carriers had not been told that the mill had no spare shaft and would remain stopped until the new one arrived. The Court of Exchequer treated the loss as too remote. The celebrated formulation created two limbs. First, damages may cover losses arising naturally, according to the usual course of things, from the breach itself. Secondly, damages may cover losses arising from special circumstances if those circumstances were known to both parties at the time of contracting.

The historical importance of Hadley is often misunderstood. It is not merely a case about foreseeability. It is a case about communication, allocation of risk, and the formation-time perspective of contract. If the promisee faces unusual exposure, the promisor must be informed before the contract is made, so that the promisor can decline, charge more, insure, or expressly limit liability. That is why remoteness is not simply a moral rule about fault. It is a commercial rule about pricing risk.

Nineteenth- and early twentieth-century cases then developed a parallel principle now called mitigation. The common law became reluctant to allow claimants to let losses accumulate where reasonable alternatives existed. The classic statement in British Westinghouse Electric and Manufacturing Co Ltd v Underground Electric Railways Co of London Ltd frames mitigation as a qualification upon the compensatory principle. The claimant is compensated for loss naturally flowing from breach, but must take reasonable steps to avoid further loss. The law does not punish a claimant for failing to behave perfectly. It asks only for reasonableness in the circumstances, judged without undue hindsight.

The twentieth century refined remoteness in two directions. First, cases such as Victoria Laundry and The Heron II replaced older language of directness with a more careful inquiry into probability, knowledge and type of loss. Ordinary business profits may be recoverable where delay foreseeably deprives a trader of use of profit-making equipment. Exceptional profits from unusually lucrative contracts generally require notice. Secondly, modern commercial cases, especially The Achilleas, ask whether the defendant can properly be taken to have assumed responsibility for the relevant type of loss. That language is controversial, but it reflects an older contractual idea: damages should correspond to the risks undertaken by the promisor, not merely to losses which, with hindsight, can be traced causally to breach.

The history therefore shows two recurring tensions. Remoteness balances compensation against the promisor’s need to know the scale of potential liability. Mitigation balances compensation against the claimant’s responsibility not to increase recoverable loss unreasonably. Both doctrines police the boundary between loss caused in fact and loss recoverable in law.

The first principle is that remoteness concerns the recoverability of a kind or type of loss, not every detail of its amount or precise manner of occurrence. The claimant must identify the loss at the correct level of generality. Lost ordinary profits, loss of a valuable commercial opportunity, physical damage to property, market price differences, wasted expenditure, and exceptional collateral losses are different categories. A defendant may be responsible for one but not another. The question is not whether the precise pounds-and-pence consequence was predicted. It is whether the type of loss was within the legally relevant contemplation of the parties when the contract was made.

The second principle is the Hadley v Baxendale two-limb test. Under the first limb, loss is recoverable if it arises naturally, according to the usual course of things, from the breach. This covers ordinary consequences of non-performance. A seller who fails to deliver goods in a rising market is ordinarily liable for the market difference; a contractor who delays delivery of equipment to a business may be liable for ordinary profits lost from non-use. Under the second limb, unusual losses are recoverable if special circumstances were communicated to the defendant before or at contracting, so that the loss may reasonably be supposed to have been in the contemplation of both parties. Notice after formation will not normally suffice, because the promisor then has no chance to price, insure, refuse, or limit the risk.

The third principle is that the contractual test is stricter than tortious reasonable foreseeability. In The Heron II, the House of Lords rejected the proposition that the tort standard from The Wagon Mound could simply be transplanted. Contractual liability is based on undertaking. It therefore requires more than a mere foreseeable possibility. The loss must be sufficiently likely, often expressed as liable to result or not unlikely to result. The exact verbal formula is less important than the conceptual point: contract damages are not open-ended liability for all foreseeable factual consequences.

The fourth principle is that knowledge has two forms. Imputed knowledge is knowledge of ordinary business circumstances which reasonable persons in the parties’ position would possess. Actual knowledge is knowledge of special facts communicated or otherwise known. Hadley’s first limb generally rests on imputed knowledge; the second rests on actual knowledge. In practice the boundary may blur. For example, a carrier knows that commercial delay may cause some loss, but may not know that delay will stop an entire mill, cause loss of a uniquely profitable sub-contract, or trigger liability under a separate chain of contracts.

Hadley v Baxendale remains the indispensable starting point. Its significance is not its age but its structure. The court refused to allow the millers to recover lost profits because the carrier did not know the special fact that the mill would be idle until the shaft was returned. The case supplies the two-limb test which still organises the subject: ordinary loss recoverable without special notice, unusual loss recoverable only where special circumstances were known at formation.

Victoria Laundry then demonstrated the flexibility of Hadley. The defendants delayed delivery of a boiler to a laundry business. Ordinary profits from the laundry’s lost use of the boiler were recoverable: the seller knew the buyer was a commercial laundry and that delay in delivery of profit-earning equipment would naturally cause some business loss. But exceptional profits from particularly lucrative dyeing contracts were not recoverable because those special opportunities had not been communicated. The case is useful because it makes students separate ordinary commercial loss from exceptional commercial loss.

The Heron II is the leading authority on the degree of probability required. A ship deviated and delivered sugar late into a falling market. The owners knew the cargo was sugar and that sugar prices fluctuated. The House of Lords held the loss recoverable, but insisted that contract remoteness is narrower than tortious foreseeability. The loss must be not unlikely or liable to result, not merely a remote possibility. This is often the case which distinguishes a strong answer from a merely descriptive Hadley answer.

The Achilleas is the modern pressure point. A charterer redelivered a vessel late. Because the shipowner missed the cancellation date for a lucrative follow-on charter, it had to renegotiate that charter at a lower market rate for the whole period. The conventional Hadley analysis might have suggested foreseeability: late redelivery can affect follow-on fixtures. The House of Lords nevertheless limited recovery to the market rate for the period of delay. The speeches differ, but the case is now associated with assumption of responsibility. It is especially important in commercial contracts where market practice contradicts open-ended foreseeability.

British Westinghouse is the foundation of mitigation. Defective turbines were supplied. The claimant replaced them with more efficient turbines, generating savings greater than the claimed loss. The House of Lords held that the compensatory principle required credit for benefits resulting from reasonable mitigation. The case supplies both limbs of mitigation reasoning: claimants must take reasonable steps to reduce loss, and gains from those steps may reduce the recoverable award.

Payzu v Saunders illustrates the limits of pride and principle in mitigation. The seller, after the buyer’s default, offered to continue supplying goods on cash terms. The buyer refused and claimed larger losses. The Court of Appeal held that it was unreasonable to reject a commercially sensible offer merely because it came from the contract-breaker. The case does not require an innocent party always to deal again with a defaulter. It requires an assessment of reasonableness, including risk, trust and commercial dignity.

Bunge SA v Nidera BV shows the Supreme Court’s modern insistence that damages remain compensatory rather than punitive or mechanical. Where an anticipatory breach occurred in a sale contract, later events showed that the contract would in any event have been cancelled without loss because of an export ban. Damages were assessed by reference to the true loss, not by ignoring known facts. The case is not a remoteness case in the narrow Hadley sense, but it is crucial for damages technique: remoteness and mitigation operate within a broader compensatory framework.

See practice questions section below.

See further reading section below.