How much would it cost to buy a stall for selling chat and pani puri and put it in a mall (including the mall's rent) how much would it cost to hire an employ to work at that stall for 10 hours every day please be more specific

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?