You and your roommate are in a dilemma. You are both taking economics and accounting and have an economics exam tomorrow afternoon. You’re worried that you won’t have enough study time and are debating skipping accounting to use the time to study for the exam. You’re not worried about your accounting grade, but your roommate is still trying to convince you to not skip accounting because you’ve already paid your tuition. Explain how your roommate is guilty of committing a sunk cost fallacy.