Final answer:
The agreement between Marissa and Shelby, where Marissa keeps any sale amount over $220,000 from a home listed at $225,000 and earns nothing if she doesn't find the buyer, is a Net Listing Agreement.
Step-by-step explanation:
In the scenario provided, Marissa has agreed to represent Shelby in the sale of his home, with specific terms dictating her compensation based on finding a buyer. This type of agreement is known as a Net Listing Agreement. Under this agreement, Marissa is entitled to keep any amount she earns above a set price, which in this case is anything above $220,000 from the sale of the home listed at $225,000. If she does not find the buyer, she earns nothing, which highlights the unique financial motivation and the potential for a conflict of interest inherent in this type of listing. It's worth noting that net listings are not legal or advised in all states due to their potential for unethical practices.