Which of the following statements applies to the measure of damages when performance has begun under a contract?

In the context of contract law, when performance has begun under a contract, the measure of damages is particularly focused on the value of the work completed and what was agreed upon in the contract. If a party has partially performed their obligations under the contract, they may be entitled to recover the entire contract price, or at least the reasonable value thereof, for the work that has been completed up to the point of the breach.

The principle here is that a party should not be unjustly enriched at the expense of the other. Therefore, if the plaintiff has substantially performed their obligations, they can recover the whole contract price since they have provided a benefit to the other party by fulfilling a portion of the agreement.

This approach aims to encourage parties to perform their contractual obligations and also reflects the idea that the frictions of contract breaches should not penalize those who have put in time and resources after starting performance.

Consequently, this often allows for recovery beyond just the immediate costs incurred or payments made, accommodating for the value of the benefits received by the other party due to the partial performance.