Gerald is the owner of a popular restaurant. he has appointed a manager who takes care of the day-to-day operations of the restaurant and reports to gerald at the end of a week. the manager is assisted by a junior manager, who supervises the rest of the staff in the restaurant. thus, gerald's restaurant is using a

Four key marketing decision variables are price (p), advertising (a), transportation (t), and product quality (q). consumer demand (d) is influenced by these variables. the simplest model for describing demand in terms of these variables is: d = k – pp + aa + tt + qq where k, p, a, t, and q are constants. discuss the assumptions of this model. specifically, how does each variable affect demand? how do the variables influence each other? what limitations might this model have? how can it be improved?