Understanding a target customer base allows a company to a) develop products that are more desirable and cheaper than the competition b) create a marketing strategy that is tailored for a particular group of consumers c) write a marketing plan that is effective for a product, regardless of consumer characteristics d) develop and market a product that is desired by all possible consumers

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?