Illustrations of this kind, which may be indefinitely multiplied, do not prove that the material, economic changes are the cause of all other changes, political, scientific, and ethical; for in many cases the economic changes themselves appear to be the results of changes of the other kinds.

There is a constant action and reaction between economic forces and other forces and interests in human society, and the needs of economic adjustment are constantly changing in nature.
Sec.3.

#Present-day problems: main subjects#.

The particular economic problems in America at this time are determined by the whole complex economic and social situation.

Two main factors in this may be distinguished: the objective and the subjective, or the material environment and the population composing the nation.