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Historically, the economists first expressed the price of a good as a function of demand (holding the other economic variables, like income, constant), and plotted the price-demand relationship with demand on the x (horizontal) axis (the [[demand curve]]). Later the additional variables, like prices of other goods, came into analysis, and it became more convenient to express the demand as a [[multivariate function]] (the '''demand function'''):
<math>{demand} = f({price}, {income}, ...)</math>, so the original demand curve now depicts the ''inverse'' demand function <math>
==Definition==
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