Restatement Second of Contracts § 371
If a sum of money is awarded to protect a party's restitution interest, it may as justice requires be measured by either
- the reasonable value to the other party of what he received in terms of what it would have cost him to obtain it from a person in the claimant's position, or
- the extent to which the other party's property has been increased in value or his other interests advanced.
Copyright, The American Law Institute