Suppose your teacher finishes class 30 minutes early on the day before an exam. she indicates taht you may leave, or stay on for an optional study period which will last for the remaining 30 minutes of the scheduled class time. you should:
-always choose to stay for the study period, since you have already paid for the class time.
-only choose to stay if you like the instructor, since the value obtained is highed than if you disliked the instructor
-only choose to stay if the additional benefits gained form the extra study session are greater than the additional cost of 30 mins more in class
-only choose to stay for the study session if you do not plan to study on your own for the exam