Karl Marx did not draw blueprints for socialism unlike the precedent utopian socialists. His lifework Das Kapital (1867,85, 94) totally concentrates into explication of principles of capitalist market economy. Nevertheless, almost in every chapter or part of this great work, we are suggested interesting theoretical possibilities for socialist communal societies beyond capitalism. This paper reexamines Marx's value theory as a typical case, in three sections as follows; (1) The Forms and the Substance of Value, (2) Possibilities for Socialist Price (s-price) Forms, and (3) An Egalitarian Theory of Labor. Some theoretical problems, which were left by Marx, must also be discussed upon the ground of my book, Political Economy for Socialism (Macmillan and St. Martin's, 1995).