Answer:
Equity theory
Step-by-step explanation:
Equity theory is a theory that was developed by John Stacey Adams in 1963. This states that fairness and equity are essential components in a person's motivation. The theory states that people are motivated by fairness, which means that they might lose their motivation if they notice inequities in their group or their referent group. This is the case in this example. As you know that graduate students at other departments are not required to follow the tutoring rules, you are more likely to lose your motivation to follow this rule.