Answer:
knowledge
Step-by-step explanation:
When it comes to marketing products, the manager plays a vital role. In order to reach out to customers, he can talk to them regularly whether they like the product and service. He can also ask if they have any suggestions for improvements.
The product and service are seen by the target audience's eyes thus, it is essential that the manager asks them for feedback. This will allow him to determine whether his knowledge on what his customers like is accurate or true. It will also aid him in creating efficient marketing strategies.