If we are on the frontier, to produce more guns and less butter, we need to: A. Find ways to reduce waste to produce more guns and less butter.
B. Use unemployed resources to produce more guns and less butter.
C. Move land, labor, and capital from the production of guns to the production of butter.
D. Move land, labor, and capital from the production of butter to the production of guns.
E. Develop new technologies that permit us to produce more guns and less butter.

mass production/ assembly line production

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.

some american cities felt workers were being oppressed by business monopolies