What effect would each of the following have on the value of the firm? (a) A new advertising campaign increases the sales of the firm substantially. (b) A new competitor enters the market. (c) The production department achieves a technological breakthrough, which reduces production cost. (d) The firm is required to install pollution-control equipment. (e) The work force votes to unionize. (f) The rate of interest rises. (g) The rate of inflation changes.