Loss of Profits which contractor would have earned

Loss of profit which the contractor would otherwise have earned but for the delay or disruption
This is based on the argument that a contrator has lost the opportunity to earn additional profit as a result of being delayed on another project . Perhaps he had to turn down a lucrative contract because this project continued to absord his staff and labour .
If such losses have really been incurred , then very persuasive  evidence will be required before any judge or arbitrator will consider making an award .