Final answer:
Marvel Comics' agreement to allow the use of Spiderman and Incredible Hulk characters on various merchandise in exchange for a percentage of the revenues is known as licensing. It is a strategic business model used to monetize intellectual property.
Step-by-step explanation:
Marvel Comics allowed various organizations to use its Spiderman and Incredible Hulk characters to market a wide variety of toys and clothing items, receiving a percentage of the gross revenues. This arrangement is known as licensing. Licensing is a business agreement where the owner of a product, service, or intellectual property grants permission to another party to use that property in exchange for royalties or a specific fee. By allowing organizations to create merchandise based on its popular characters, Marvel Comics capitalizes on brand recognition and fan base to generate revenue without having to produce and sell the products themselves; this is a common practice in the entertainment industry.