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 2,765. case’s share of that market was 22 percent, while fiat comprised just 12 percent of the market. if approved, by how much would the post merger herfindahl-hirschman index increase