In 1974 the number of people employed in the u. s. steel industry was 521,000. by 2006 the total number of people employed had dropped to 156,000. which of the following was a major contributing factor in the decreased employment and income in steel manufacturing?
(a) increased tariffs on imported steel led to less foreign competition.
(b) decreasing productivity per worker led to a decrease in labor demanded.
(c) the growth of high paying jobs in the service industry decreased steel wages.
(d) more processes were automated due to improvements in technology.