Demand Curve
the relationship between price and quantity
- we actually graph the inverse demand curve
Demand Curve for Perfect Substitutes
X = M/Px
Three parts of the curve
- Px/Py > MUx/MUy
- P/Py = MUx/MUy
- Px/Py < MYx/MUy
Demand Curve for Perfect Complements
X = M/(Px+Py)
- Inverse Demand Curve: Px = M/x - Py (what we graph)
Demand Curve for Cob Douglas
X = a/a+b M/px
Monotonic Tranformation: U = alnx + blny
Normal Goods
the demand for a good increases when income increases and decreases when income decreases
- quantity demanded always changes in the same way income changes
Inferior Goods
an increase of income results in a reduction in the consumption of the good
- demand decreases as income increases
Comparative Static
what happens to one variable when another variable changes
-derivative