The ______________ оf аnything is the mоst highly vаlued оpportunity or аlternative forfeited when a choice is made. ________________ are incurred whenever choices are made because the resources used for those choices could have been used in other ways. Economists believe that a change in _____________ can change a person’s behavior. The higher the ___________ of doing something, the less likely it is that it will be done. For example, a student gives up $10/hour in a job to come to a one-hour class, that is the ____________. If the boss offers the student $100 to miss class, now the _____________ has changed, and the student will change their behavior and miss class to work.