THEORY OF PRODUCTIVE EFFICIENCY 199 occupational groups, and secure, both for the lower and higher groups of wage-earners, an agreement from em- nloyers as to a practical, technical method for determining specifically what the respective shares of each and all groups shall be in the productive gains in industry. In this connection, the American Federation of Labor has already established a new basic principle, which it has termed “the social wage,” namely, that it is not sufficient for labor alone to have a share in increased productivity, but such a share should be proportionate to other classes in order that the aconomic and social advancement of wage-earners may be relatively the same as other groups. Organized labor and consumers will also in due time un- Joubtedly take up practically the relation of the methods of security flotations and corporation finance to produc- tive gains, and raise the question as to the participation of investment bankers and the owners of corporate securities. These questions are ultimately fundamental and will re- Juire time and constructive thought and effort. For the immediate future, the pressing problem will undoubtedly be the working out of the shares of occupational groups in a practical and just way. These and other important ques- lions may be also more comprehensively weighed in a sub- sequent chapter, after the next and final development of post-war wage theory has been considered, namely, the re- lation between wages, purchasing power, and industrial prosne, tv