Chapter 1: The Commodity

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[For] the modern pedlars of free trade [...] who must get rid of their commodities at any price [...] there exists neither value, nor magnitude of value, anywhere except in its expression by means of the exchange relation, that is, in the daily list of prices current on the Stock Exchange.
[...] it is not the exchange of commodities which regulates the magnitude of their values, but rather the reverse, the magnitude of the value of commodities which regulates the proportion in which they exchange.