I am working as an Assistant Manager HR in a chemical distribution company. I have had three positions in a similar profile for which we decided on the salary. I easily closed two of them, but for the third position, there were no candidates available in the same salary range. Therefore, I had to hire the best-fitted candidate at a slightly higher salary. After some time, one of the employees came asking why we hired someone in the same position for a higher salary, despite having the same experience and qualifications. Kindly suggest how I can motivate him and resolve this issue.