country by experience. Thus, the originally imperceptible difference between the nominal weight and the metallic weight of a metal coin can grow apace until it reaches the point of absolute separation. The mint name of money parts company with its substance and exists outside of it in worthless slips of paper. Just as the exchange value of commodities is crystallized by their process of exchange into gold money, so is gold money sublimated in its currency into its own symbol first in the form of worn coin, then in the form of subsidiary metal currency, and finally in the form of a worthless token, paper, mere sign of value.
Gold coin has produced its substitutes, first metallic and then paper, only because in spite of its loss of metallic weight it continued to perform the function of coin. It did not circulate because of its wear and tear; on the contrary, it wore out to a symbol because it continued to circulate. Only in so far as gold money becomes simply a token of its own value in the process of circulation, can mere tokens of value take its place.
In so far as the movement C—M—C represents a dynamic unity of two processes C—M and M—C which pass directly one into the other, or in so far as a commodity passes through the complete process of its metamorphosis, it express its exchange value in price and in money only to discard that form at once and to become again a commodity or, rather, a use-value. That is to say, it develops only an apparent assertion of the independence of its exchange value. On the other hand, we have seen that gold, in so far as it performs the function of coin or in so far as it
