Compensatory Damages: Causation, Foreseeability, Certainty, and Mitigation

Compensatory damages serve a single organizing idea: the rightful-position principle. The law seeks to place the injured plaintiff, so far as money can do it, in the position she would have occupied had the wrong never occurred. The content of that 'rightful position' differs by the underlying claim. In contract, the default measure protects the expectation interest—the benefit of the bargain—so the plaintiff is placed where she would have been had the contract been fully performed.

In tort, by contrast, the measure restores the status quo ante: the plaintiff is returned to the position she occupied before the defendant injured her, because there was no bargain promising her a better position. This distinction drives nearly every essay: a contract plaintiff recovers lost expected gains, while a tort plaintiff recovers losses caused by the defendant's wrong but generally not the upside of a deal she never struck.

The canonical formula for contract expectation damages, drawn from Restatement (Second) of Contracts §347, is: loss in value + other loss (incidental and consequential) − cost avoided − loss avoided. 'Loss in value' is the difference between the performance the plaintiff was promised and what she actually received. 'Other loss' captures incidental damages (costs of dealing with the breach, such as expenses to find a substitute) and consequential damages (collateral losses like lost profits on resales). 'Cost avoided' subtracts expenditures the plaintiff saved by not having to perform her own side,

and 'loss avoided' subtracts gains the plaintiff salvaged—for instance, by reselling goods or redeploying labor to another job.

A student who mechanically applies this four-part formula will reach the right number on most contract-damages questions and will simultaneously surface the mitigation issue, because 'loss avoided' is mitigation built into the measure.

Expectation damages presuppose that the bargain was a profitable one. When expectation is too speculative to prove—classically because the venture was new and had no track record—the plaintiff may fall back on the reliance interest, recovering expenditures made in reasonable reliance on the contract, or on the restitution interest, recovering the value of benefits conferred on the breaching party.

These three interests (expectation, reliance, restitution) form a descending hierarchy of certainty: expectation is the most generous but hardest to prove, reliance is the safe harbor, and restitution looks to the defendant's gain rather than the plaintiff's loss. A skilled essayist identifies which interest the facts will support and explains why the others fail.

Causation is the first gate. The plaintiff must show that the defendant's breach or tort was both the actual ('but for') cause and the proximate (legally responsible) cause of the claimed loss. Actual cause asks whether the injury would have occurred but for the defendant's conduct; proximate cause limits liability to consequences that bear a sufficiently close relationship to the wrong, screening out freakish or attenuated chains.

In contract, proximate-cause analysis is largely folded into the foreseeability requirement; in tort, it is a separate proximate-cause inquiry that asks whether the harm was a foreseeable result of the risk the defendant created.

Foreseeability is the most heavily tested damages limitation, governed in contract by the two rules of Hadley v. Baxendale. First, the breaching party is liable for general damages—those arising naturally, according to the usual course of things, from the breach itself. Second, the breaching party is liable for special or consequential damages—losses outside the ordinary course—only if those losses were reasonably foreseeable to the breaching party at the time the contract was made, typically because the plaintiff communicated the special circumstances.

The temporal anchor is critical: foreseeability is measured at formation, not at breach, so a plaintiff who first reveals her special needs after signing cannot recover consequential losses tied to them. In the classic case the mill's lost profits during the delay were not recoverable because the carrier had no reason to know the broken crankshaft was the mill's only one and that the mill would stand idle until its return.

Tort foreseeability operates differently. Under the eggshell-plaintiff (thin-skull) rule, a tortfeasor takes the victim as she finds her and is liable for the full extent of physical harm even if its severity was unforeseeable, so long as some harm of the general type was foreseeable. Thus a defendant who foreseeably bruises a hemophiliac is liable for the unforeseeably fatal bleed. The contract rule cabins consequential damages to what the breaching party knew; the tort rule extends liability to unforeseeable extent once foreseeable type is established.

Keeping these two foreseeability regimes distinct—knowledge-at-formation in contract versus risk-and-extent in tort—is a reliable way to earn points on a crossover essay that blends a breach with a personal-injury claim.

The certainty requirement insists that damages be proven with reasonable certainty as to both the fact of loss and its amount. Courts are far stricter about the fact of loss than the precise amount: once it is reasonably certain that the plaintiff suffered some loss, the law tolerates considerable imprecision in quantifying it, resolving doubts against the wrongdoer who created the difficulty of measurement. The doctrine's sharpest edge is the lost-profits problem. Lost profits of an established business with a proven earnings history are generally recoverable, because past performance supplies a reliable baseline.

Lost profits of a brand-new venture, by contrast, were traditionally deemed too speculative to satisfy the certainty requirement—the so-called new-business rule—because there is no track record from which to project what the business would have earned.

Modern courts, including California's, have softened the per se new-business rule into a flexible certainty inquiry: a new business may recover lost profits if it can prove them through reliable evidence such as expert testimony, comparable-business data, market studies, or pre-opening contracts. But the burden is heavy, and on a bar essay the safe analysis is to flag the certainty hurdle, note that raw projections and the owner's optimistic estimates will not suffice, and then pivot to reliance damages (recovery of out-of-pocket expenditures) as the certainty-proof fallback.

Reliance damages sidestep the speculation problem entirely because the plaintiff proves what she actually spent rather than what she might have earned.

Certainty interacts with the other limitations. A loss that is foreseeable and caused by the breach may still be unrecoverable if it cannot be quantified with reasonable certainty; conversely, a perfectly certain loss is unrecoverable if it was unforeseeable. The well-trained examinee runs each claimed item of damages through all four filters—causation, foreseeability, certainty, avoidability—and explains which items survive and which fall out, rather than awarding a lump sum. This itemized discipline is what separates a passing Remedies answer from a thin one.

Where damages cannot be proven at all, the plaintiff may still recover nominal damages to vindicate the legal right and to anchor a possible punitive award in tort.

The avoidable-consequences doctrine, loosely called the 'duty to mitigate,' bars recovery for any loss the plaintiff could have avoided through reasonable effort and without undue risk, expense, or humiliation. It is not a true duty—the plaintiff is not liable for failing to mitigate—but a damages limitation: avoidable losses are simply subtracted from the award. The standard is reasonableness, not perfection or heroism.

A wrongfully discharged employee must make reasonable efforts to find comparable substitute employment, but need not accept a job that is different or inferior in kind, in a distant location, or demeaning; if she does accept lesser work, her earnings (or earnings she could reasonably have obtained) are deducted from her contract damages. The California case Parker v. Twentieth Century-Fox (the Shirley MacLaine case) illustrates the limit: an actress need not mitigate by accepting a substantially different role, so the defendant could not offset the salary she declined for a Western when her contract was for a musical.

Crucially, the burden of proving failure to mitigate rests on the breaching party, not the plaintiff. The defendant must show that suitable substitute opportunities existed and that the plaintiff unreasonably failed to pursue them. A plaintiff who does incur reasonable costs while attempting to mitigate may recover those expenses as incidental damages even if the mitigation effort ultimately fails—the law encourages, and reimburses, reasonable salvage attempts.

Mitigation also encompasses the rule that a plaintiff may not continue performance after a clear repudiation if doing so would pile up avoidable costs; she must stop and sue rather than run up damages the breaching party will have to pay.

Mitigation pervades the other doctrines. In sales contracts, the buyer's cover remedy and the seller's resale remedy under the UCC are mitigation in action—measuring damages by the difference between the contract price and a reasonable substitute transaction. In tort, an injured plaintiff must seek reasonable medical treatment to avoid aggravating her injuries, and unreasonable refusal of treatment cuts off recovery for the avoidable worsening.

Because 'loss avoided' is already a subtrahend in the expectation formula, a complete contract-damages analysis necessarily addresses mitigation, and a complete tort analysis should ask whether the plaintiff reasonably contained her harm. Spotting and allocating the mitigation burden to the defendant is a frequently rewarded move.

The Three Contract Interests Compared