Breach of contract

What happens when you don't do what you oughta.

Quelle domage

Just because one party breaches the contract, it doesn't mean the other suffers a loss.
Just because one party suffers a loss, it doesn't mean the other breached the contract.
For very sound reasons the law of contract imposes limitations (“causation”, “proximity” and “remoteness of damage”) on the damages a party may recover for breach of contract:

Causation: The breach needs to be the operating cause of the innocent party's loss;
Remoteness: They need to have been the sorts of losses the parties reasonably contemplated might arise from a breach when they entered the contract – i.e. they need to be reasonably foreseeable - the "usual consequences" of a breach of the contract.

These ordinary principles apply pragmatically to limit the damages a party must pay to what is reasonable for what that party was responsible.

Hadley v Baxendale

All summed up very nicely in the case of Hadley v Baxendale where Baron Alderson said:

Where two parties have made a contract which one of them has broken, the damages which the other party ought to receive in respect of such breach of contract should be such as may fairly and reasonably be considered either arising naturally, i.e., according to the usual course of things, from such breach of contract itself, or such as may reasonably be supposed to have been in the contemplation of both parties, at the time they made the contract, as the probable result of the breach of it.

Now, if the special circumstances under which the contract was actually made were communicated by the plaintiffs to the defendants, and thus known to both parties, the damages resulting from the breach of such a contract, which they would reasonably contemplate, would be the amount of injury which would ordinarily follow from a breach of contract under these special circumstances so known and communicated.

But, on the other hand, if these special circumstances were wholly unknown to the party breaking the contract, he, at the most, could only be supposed to have had in his contemplation the amount of injury which would arise generally, and in the great multitude of cases not affected by any special circumstances, from such a breach of contract.

For, had the special circumstances been known, the parties might have specially provided for the breach of contract by special terms as to the damages in that case, and of this advantage it would be very unjust to deprive them.

since Hadley

Consequential loss

See: consequential loss

Indemnities

Compare with an Indemnity where one party agrees to be responsible for a loss the other suffers even when the first doesn't breach the contract.