Answer: who pose as customers to check on availability and pricing of a firm's products or services and on the quality of the customer service.
Step-by-step explanation:
Mystery shoppers are hired by a company as a form of self-evaluation in order to check things like the availability of goods and services as well as the quality of their customer service. They also check to see if their employees are sticking to the codes of conduct of both the company and the regulatory bodies.
Mystery shoppers can also be hired by a company to check out the affairs of another company the same way they would the company hiring them. They would then be paid for their services.