Mark and Molly met at a New Year's Eve party held December 31, Year 1. They instantly bonded, fell madly in love, and were married at 11 :38 p. m. that night. Identify Mark's filing status for Year 1. a. Single
b. Married filing jointly
c. Head of household
d. Surviving spouse

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?