the fourth subject ; who is the marketer

Is one that sells goods or services in or to a market, especially one

that markets a specified commodity:

A person whose duties include the identification of the goods and services desired by a set of consumers, as well as the marketing of those goods and services on behalf of a company. See also advertising.Duties and responsibilities of marketer
1. Focus on the Customer
2. Monitor the Competition
3. Own the Brand.
4. Find & Direct Outside Vendors.
5. Create New Ideas.
6. Communicate Internally.
7. Manage a Budget.

8. Understand the ROI.
9. Set the Strategy, Plan the Attack, and Execute.