Suppose that in february 2020, policymakers undertake the type of policy that is necessary to bring the economy back to the natural level of output, given the scenario just described. in april 2020, exports decrease because china implements trade restrictions on goods. because of the

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?