New equipment and other improvements reduced the amount of time---from eleven hours in 1982 to six in 1988--needed by workers so that they could produce a ton of steel.
B workers need in producing D workers needed to produce
New equipment and other improvements reduced the amount of time---from eleven hours in 1982 to six in 1988--needed by workers so that they could produce a ton of steel.
B workers need in producing D workers needed to produce