_Active Capital Goods._--The hammer which fashions the iron, the awl which pierces the leather, and the saw that cuts the log into boards have an active function to perform. They do not receive utilities, but impart them. They manipulate other things and are not themselves manipulated; and except as unavoidable wear and tear injure or destroy them, they are not themselves at all changed by the processes in which they take part. They are the workman's active assistants in the attacks that he makes on the resisting elements of nature. Passive instruments, then, and active ones--things which receive utility, as industry goes on, and those which impart utility--constitute the two generic kinds of capital goods. What is commonly called "circulating capital" is a permanent stock of passive capital goods; and, in like manner, what is usually known as "fixed capital" is such a stock of capital goods of the active kind. The materials and the unfinished goods that are scattered through a modern mill and receiving utility are what the manufacturer would at this moment identify if he were asked to point out the things in which he has circulating capital invested; while the mill, the machinery, the land, etc., which are imparting utility, are what he can point to as now constituting his fixed capital. At a later time there will be other goods of both kinds in his possession, and these will at that time embody the two kinds of capital. While a primitive man would have little occasion to use the term _capital goods_, he would possess both varieties of the goods which the term denotes.