Please discussion the case below

The standard measure of compensatory damages is the difference between the value of the breaching party's promised performance under the contract and the value of her or his actual performance.

Ex: Randall contracts to perform certain services exclusively for Hernandez during the month of March for $4000. Hernandez cancel the contract and is in breach. Randall is able to find another job during March but can earn only $3000. he can sue Hernandez for breach and recover $1000 as compensatory damages. Randall can also recover from Hernandez the amount that he spent to find the other job