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January 18, 2005
Theory of the Consumer
We can derive the demand curve from the Two Goods - Two Prices diagram from the Theory of the Consumer.
The movement from A to B (above) occurs because lowering the price pivots the budget constraint.
The slope of the demand curve is not unambiguous. The decomposition of the budget constraint change into income and substitution effects (not shown here) can lead to a decrease in quantity when the price decreases.
Posted by bparke at January 18, 2005 09:23 PM