Page "Jules Dupuit" Paragraph 2
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Engineering questions led to his interest in economics, a subject in which he was self-taught.
His 1844 article was concerned with deciding the optimum toll for a bridge.
It was here that he introduced his curve of diminishing marginal utility.
As the quantity of a good consumed rises, the marginal utility of the good declines for the user.
So the lower the toll ( lower marginal utility ), the more people who would use the bridge ( higher consumption ).
Conversely as the quantity rises ( people allowed on the bridge ), the willingness of a person to pay for that good ( the price ) declines.
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