Henry is a 52 year-old member of the research staff at UPMC. He has been in that position of 10 years, While he enjoys his work and the benefits of a steady job are important, he is not happy. He overheard one of his co-workers discussing the raise that he just received. The co-worker now makes $2/hour more than Henry and has only been with UPMC for 3 years. Both Henry and his co-worker are in the same job grade and have similar performance appraisal ratings. Henry's dissatisfaction has resulted in a diminishing work ethic and performance. What motivational theory might explain Henry's behavior? Justify your