Discussion - Judson, Harry Pratt; Laughlin, J. Laurence; Gray, John H.; Carlton, Frank T.; Scott, William A.; Groat, George G.; Weatherly, Ulysses G.; Hotchkiss, W. E.; Hoxie, R. F.; Smalley, H. S.; Johnson, A. S.; Marshall, L. C.; et al. (Journal of Political Economy, 1909)