Since Ricardo gave to classical political economy its final shape, having formulated and elaborated with the greatest clearness the law of the determination of exchange value by labor-time, it is natural that all the polemics among economists should center about him. Stripped of its puerile[37] form this controversy comes down to the following points: _First_: Labor itself has exchange value, and different kinds of labor have different exchange values. We get into a vicious circle by making exchange value the measure of exchange value, because the measuring exchange value needs a measure itself. This objection may be reduced to the following problem: Given labor-time as the intrinsic measure of exchange value, develop from that the determination of wages. The theory of wages gives the answer to that. _Second_: If the exchange value of a product is equal to the labor-time contained in it, then the exchange value of one day of labor is equal to the product of that labor. In other words, wages must be equal to the product of labor.[38] But the very opposite is actually the case. Ergo. this objection comes down to the following problem: How does production, based on the determination of exchange value by labor-time only, lead to the result that the exchange value of labor is less than the exchange value of its product? This problem is solved by us in the discussion of capital. _Third_: The market price of commodities either falls below or rises above its exchange value with the changing relations of supply and demand. _Therefore_, the exchange value of commodities is determined by the relation of supply and demand and not by the labor-time contained in them. As a matter of fact, this queer conclusion merely amounts to the question, how a market price based on exchange value can deviate from that exchange value; or, better still, how does the law of exchange value assert itself only in its antithesis? This problem is solved in the theory of competition. _Fourth_: The last and apparently the most striking objection, if not raised in the usual form of queer examples: If exchange value is nothing but mere labor-time contained in commodities, how can commodities which contain no labor possess exchange-value, or in other words, whence the exchange value of mere forces of nature? This problem is solved in the theory of rent. CHAPTER II. MONEY OR SIMPLE CIRCULATION. In a parliamentary debate on Sir Robert Peel’s Bank Act of 1844 and 1845, Gladstone remarked that not even love has made so many fools of men as the pondering over the nature of money. He spoke of Britons to Britons. The Dutch, on the contrary, who, from times of yore, have had, Petty’s doubts notwithstanding, “angelical wits” for money speculation have never lost their wits in speculations about money.