I mean, an Ordinary Demand Equation measures changes in quantity of X due to changes in price Px. Engel Curve measures changes in quantity of X due to changes in income M. But ODE has M in it's equation, and is simply just an algebraic variant of the Engel curve!
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2$\begingroup$ Engel curve assumes the price is constant, and demand curve assumes income constant. There is only demand function, no engel curve equation or demand equation. $\endgroup$ – Kun Feb 14 '16 at 2:43
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1$\begingroup$ You are very welcome $\endgroup$ – Kun Feb 14 '16 at 21:54
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Engel curve assumes the price is constant, and demand curve assumes income constant. There is only demand function, no engel curve equation or demand equation.
