Answer: Compensating Differential.
Step-by-step explanation:
There are jobs that we wouldn't do unless offered a higher amount of money because these jobs might be undesirable for a range of reasons such as being more dangerous than other jobs or being socially looked down upon.
This extra amount of money that we are offered to do such jobs is called the Compensating differential. It is paid to entice people to do jobs they would otherwise not want to do. The civil engineer making such huge amounts of money is being paid that amount because of the danger involved in inspecting cables on suspension bridges.
The rest are also being paid according to the risk they are incurring.