Inverse demand function
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In economics, an inverse demand function is a function that compares the quantity of output to the market price for that output.
In mathematical terms, if the demand function is f(x) then the inverse demand function is 1/f(x), ie it is the demand function with the axes switched. a normal demand curve the vertical axis is price and the horizontal axis is demand. On an inverse demand curve, the vertical axis is demand and the horizontal axis is price.