- Complement good: A good that is usually bought with another good eg ipod / ipod cover
- Elasticity: How sensitive a good is to changes in price, income or other goods.
- Inferior good: A good is described this way if quantity demanded falls when income rises.
- Luxury good: Consumption of this good increases with a rise in income.
- Normal good: This good is positively related to income, consumption will rise and fall with income.
- PED: Price Elasticity of Demand
- PES: Price Elasticity of Supply
- Substitute good: A consumed in the place of another good. eg ipod/ zune
- XED: Cross Elasticity
- YED: Income Elasticity