When a change in price results in an infinitely large response in quantity demanded, demand is
Unit elastic
Perfectly inelastic
Perfectly elastic
Elastic
The cross elasticity of demand measures the responsiveness of the quantity demanded of a particular good to changes in the prices of
Its substitute and its complements
Its substitute but not its complements
Its complements but not its substitutes
Its complements but not its giffen goods
Demand is perfectly inelastic when
Shift is the supply curve results is no change in price
The good in question has perfect substitutes
Shift of the supply curve results in no change in quantity demanded
Shift is the supply curve results is change in price
Investment
Income