Final answer:
The situation described is an example of marketable permits, as you and your roommate made a trade where you clean the dorm room once a week in exchange for her practising her tuba at other times or elsewhere to preserve your ability to study effectively.
Step-by-step explanation:
This situation can be related to the concept of marketable permits. Marketable permits are permits that allow a firm or individual to emit a certain amount of pollution. In this case, you and your college roommate made a deal where you would clean the dorm room once a week in exchange for your roommate practising her tuba at other times or elsewhere, thus resolving the conflict that was affecting your ability to concentrate on studying.
This resembles a marketable permit system as you and your roommate essentially created a trade where you are providing a service (cleaning the dorm room) in exchange for your roommate adjusting her tuba practice times. In this scenario, the marketable permits are the cleaning service you offer in exchange for your roommate's cooperation. Therefore, the correct answer to your question is that the situation described is an example of marketable permits.