
Karl Marx was very interested in capital -- an abstract concept referring to society's wealth. And he was interested in the persons who owned and controlled capital -- the capitalists. But the primary focus of his lifelong analysis was upon one particular species of capital, what he referred to as "industrial capital." This is the form of wealth involved in the production process -- factories, mines, railroads. He had less to say about the aspect of capital that designated the exchange process -- what he referred to as "merchant capital" and finance capital. This selective focus reflected one of Marx's main historical opinions -- the idea that history moves forward through the development of the "productive forces," and that industrial...