边际 (Chinese Wikipedia)

Analysis of information sources in references of the Wikipedia article "边际" in Chinese language version.

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Wicksteed, Philip Henry. The Common Sense of Political Economy, Including a Study of the Human Basis of Economic Law. Macmillan and Company. 1910: Bk I Ch 2 and elsewhere (page 4 at econlib.org transcription). Only at the margin is there a coincidence between the thing gained and the price paid for it.