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A graph with two marginal curves, one measured going to the right and the other measured
going to the left, is in Jevons's Theory of Political Economy (1879, second edition, Fig.
V on page 105). In that graph the horizontal axis represents two commodities with the
units defined so that the relative price is one, and marginal utility is shown in the
vertical direction.
 
Torsten Schmidt, Univ. of New Hampshire 
 
 
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