Final answer:
A franchise is a contractual system that is normally based on some unique product or service, method of doing business, or trade name, goodwill, or patent that has been developed.
Step-by-step explanation:
The contractual system that is normally based on some unique product or service, method of doing business, or trade name, goodwill, or patent that has been developed is a franchise. A franchise is a business model where a franchisee purchases the rights to start a business based on a model designed by the franchisor. The franchisor provides training, support, and brand recognition in return for franchise fees and royalty fees.