- Outline the concept of income elasticity of demand, understanding that it involves responsiveness of demand (and hence a shifting demand curve) to a change in income.
- Calculate YED using the following equation YED=%ΔQd/%ΔY
- Show that normal goods have a positive value of YED and inferior goods have a negative value of YED.
- Distinguish, with reference to YED, between necessity (income inelastic) goods and luxury (income elastic) goods.
- Examine the implications for producers and for the economy of a relatively low YED for primary products, a relatively higher YED for manufactured products and an even higher YED for services.
- Outline the concept of cross price elasticity of demand, understanding that it involves responsiveness of demand for one good (and hence a shifting demand curve) to a change in the price of another good.
- Calculate XED using the following equation XED=%ΔQd of Good X/%ΔP of Good Y
- Show that substitute goods have a positive value of XED and complementary goods have a negative value of XED.
- Explain that the (absolute) value of XED depends on the closeness of the relationship between two goods.
- Examine the implications of XED for businesses if prices of substitutes or complements change.
Obviously, you all did your homework (except for __________?) and have already watched the above video on XED... hand in your graphs now. We will watch the YED graph together and then discuss both concepts and do some tasks.
This article Meet the credit crunch winners illustrates a good example of real life YED. And Will price discounting help restaurants survive the crunch? has example of all three concepts of demand elasticities.
And for some light relief...