labor, capital, and the materials and motive forces afforded by nature. Of these, labor and the raw material of the globe are primary and indispensable . Natural motive powers may be called in to the assistance of labor, and are a help, but not an essential, of production. The remaining requisite, capital, is itself the product of labor. Its instru- mentality in production is therefore, in reality, that of labor in an indirect shape. Mill, Pol. Econ.; Wharton.
Black’s Law Online Dictionary
