(5) Ross, Edward A. The Principles of Sociology. Part II, "Social Forces," pp. 41-73. New York, 1920.
(6) Blackmar, F. W., and Gillin, J. L. Outlines of Sociology. Part III, chap ii, "Social Forces," pp. 283-315. New York, 1915.
(7) Hayes, Edward C. "The 'Social Forces' Error," American Journal of Sociology, XVI (1910-11), 613-25; 636-44.
(8) Fouillée, Alfred. Education from a National Standpoint. Translated from the French by W. J. Greenstreet. Chap. i, pp. 10-27. New York, 1892.
(9) ——. Morale des idées-forces. 2d ed. Paris, 1908. [Book II, Part II, chap. iii, pp. 290-311, describes opinion, custom, law, education from the point of view of "Idea-Forces.">[
B. Interests and Wants as Defined by the Economist
(1) Hermann, F. B. W. v. Staatswirthschaftliche Untersuchungen. Chap. ii. München, 1870. [First of the modern attempts to classify wants.]
(2) Walker, F. A. Political Economy. 3d ed. New York, 1888. [See discussion of competition, pp. 91-111.]
(3) Marshall, Alfred. Principles of Economics. An introductory volume. Chap. ii, "Wants in Relation to Activities," pp. 86-91. 6th ed. London, 1910.
(4) ——. "Some Aspects of Competition," Journal of the Royal Statistical Society. Sec. VII, "Modern Analysis of the Motives of Business Competition," LIII (1890), 634-37. [See also Sec. VIII, "Growing Importance of Public Opinion as an Economic Force," pp. 637-41.]