The Keynesian definition of involuntary unemployment has given rise to much controversy. According to this definition it is useless to discuss problems of involuntary unemployment within a consistent economic model if one of its equations is the classical supply function of labor, because there can be no involuntary unemployment within such a model. Similar problems arise whenever one tries to demonstrate the possibility of involuntary individual economic decisions within a given model of economic behavior. It is the contention of the present writer that the notion of involuntary economic decisions, to become meaningful, must be derived from a comparison between alternative economic models, or frameworks, under which society may collectively choose to operate.