1.2.3- Price, Income And Cross Elasticities Of Demand Flashcards
What is price elasticity of demand?
Measures the responsiveness of the quantity demanded of a good or service to changes in its price
What is the formula for PED?
%change in quantity demanded / %change in price
What is a price elastic good?
When the change in quantity is very responsive to a change in price
What is PED for a price elastic good?
PED>1
What is a price in elastic good?
A god that has a demand that is relatively unresponsive to a change in price
What is the PED for a price in elastic good?
PED <1
What is a unitary elastic good?
A good that has a change in demand that is equal to the change in price
What is PED for a unitary elastic good?
PED=1
What is a perfectly inelastic good?
A good that has a demand which doesn’t change when price changes
What is PED for a perfectly inelastic good?
PED=0
What is a perfectly elastic good?
A good that has a demand which falls to zero when price changes
What is PED for a perfectly elastic good?
PED=infinity
What factors influence PED?
-necessity
-substitutes
-time
-addictives
-proportion of income spent on the good
-peak and off peak demand
How does necessity influence PED?
-a necessary good will have a relatively inelastic demand
-luxury goods are more elastic
How do substitutes influence PED?
-if a good has several substitutes that are close and available, the demand is more price elastic
How does time influence ped?
The longer the time, the easier it will be for a person to find an alternative so price becomes more elastic