The Walrasian variety of this quantity satisfies the weak axiom of revealed preference, and Jevons paradox predicts a greater value for this with rising efficieny.  
The Walrasian variety of this quantity satisfies the weak axiom of revealed preference, and Jevons paradox predicts a greater value for this with rising efficieny.  A strong negative income effect in Giffin goods causes this quanity to rise with price, and the (*) subsitution effect occurs when two similar products are offered, like Coke and Pepsi  The Slutsky equation relates two forms of this quantity named for Hicks and Marshall.  Say's law states that this is created by supply.  For 10 points, name this economic quanity which represents the amount of a good consumers desire for a given price.
The Walrasian variety of this quantity satisfies the weak axiom of revealed preference, and Jevons paradox predicts a greater value for this with rising efficieny.  
{Demand}