Suppose fiat recently entered into an agreement and plan of merger with case for $4.3 billion. prior to the merger, the market for four-wheel-drive tractors consisted of five firms. the market was highly concentrated, with a herfindahl-hirschman index of 3,055. case’s share of that market was 11 percent, while fiat comprised just 5 percent of the market. if approved, by how much would the postmerger herfindahl-hirschman index increase?

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?