The ethical theory based on the concept of duty that states that firms have a responsibility to comply with the terms of the sale, inform the customer about the product, not misrepresent anything, and not coerce the customer is

Answer: Contractual theory

Explanation:

In discipline such as dismal science i. e. economics, the contractual theory tends to study how an economic actor may and thus further does construct the contractual agreement which are mostly in the occupancy of the asymmetric information. This theory is at times is mostly classified within the discipline of both economics and law.