Answer:
Negative reinforcement.
Step-by-step explanation:
Negative reinforcement is used in behavioural psychology. The term was used by Skinner, the father of operant conditioning. Through this theory, Skinner said that we respond to daily stimulus and our behaviour is a result of that situations.
In addition, Skinner used technical terms like negative and positive reinforcements. He defined negative reinforcement as a reinforced behaviour by avoiding a negative stimulus or situation, knowing negatives situations as those that make people uncomfortable.
Therefore, Joe avoided a negative situation, an uncomfortable outcome, because he could leave early; not being able to leave is a negative outcome for him. That's why this is an example of negative reinforcement.