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| | Mill, Principles of Political Economy, Book III, Chapter I: Library of Economics and Liberty |
 | | The idea of general exchange value originates in the fact, that there really are causes which tend to alter the value of a thing in exchange for things generally, that is, for all things which are not themselves acted upon by causes of similar tendency. |
 | | In considering exchange value scientifically, it is expedient to abstract from it all causes except those which originate in the very commodity under consideration. |
 | | When we are considering the causes which raise or lower the value of corn, we suppose that woollens, silks, cutlery, sugar, timber, &c., while varying in their power of purchasing corn, remain constant in the proportions in which they exchange for one another. |
| www.econlib.org /library/Mill/mlP30.html (2033 words) |
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