"His economic success equals his acquisition minus his consumption."
"When his acquisition equals his production then his economic success equals his value."
"It is the duty of the state to make each man's acquisition equal his production. That is justice."
Of course, "production" is here used in a broad sense, to mean the real social value of the services rendered, and not merely the present exchange value of the services, or the goods produced.
[179] Kornhauser, A. W., "Economic Standing of Parents and the Intelligence of their Children," Jour. of Educ. Psychology, Vol. IX., pp. 159-164, March, 1918.
[180] The coefficient of contingency is similar in significance to the coefficient of correlation, with which readers have already become familiar. Miss Perrin's study is in Biometrika, III (1904), pp. 467-469.
[181] "The Social Waste of Unguided Personal Ability." By Erville B. Woods, American Journal of Sociology, XIX (1913), pp. 358-369.
[182] See also "Eugenics: With Special Reference to Intellect and Character," by E. L. Thorndike. In Eugenics: Twelve University Lectures, pp. 319-342, New York, 1914.
[183] See U. S. Department of Labor, Children's Bureau Publication, No. 7, "Laws Relating to Mothers' Pensions in the United States, Denmark and New Zealand," Washington, 1914.
[184] American Journal of Sociology, Vol. XX, No. 1, pp. 96-103, July, 1914.