Direct Demand Function: Quantity as a Function of Price (Q = D(P))
The direct demand function, denoted as , expresses the quantity demanded (Q) as a function of price (P). Consistent with the downward-sloping nature of the demand curve, this is a strictly decreasing function. It is derived by rearranging the inverse demand function, , to solve for Q. Thus, the function is the mathematical inverse of the inverse demand function . This direct functional form is necessary for the mathematical determination of the market equilibrium price by equating it with the direct supply function.
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