assumptions: these two graphs show two sectors of the labor market for a particular kind of labor. relevant product markets are competitive. the two labor demand curves are identical. initially the quantities of labor employed in the two sectors are l1 and l' 1, and the wage rate in each sector is wn. the change in employment in sector 1 to which a wn to wu union wage increase gives rise will cause output in that sector to a) decrease by a b. b) decrease by b c d. c) decrease by c d. d) increase by a b.