Columbia subject headings:
Economics--History--20th century.
Saving and investment--History--20th century.
Surplus (Economics)--History--20th century.
Harvard subject headings:
Economics--History--20th century
Saving and investment--History--20th century.
Surplus (Economics)--History--20th century.
Princeton subject headings:
Economics--History--20th century.
Saving and investment--History--20th century.
Surplus (Economics)--History--20th century.