If the amount of beachfront land in Malibu supplied to the market remains the same even when the price of beachfront land in Malibu increases, the:. a. demand for beachfront land in malibu must be perfectly inelastic,
b. supply of beachfront land in Malibu must be perfectly elastic.
c. demand for beachfront land in Malibu must be perfectly elastic.
d. supply of beachfront land in Malibu must be perfectly inelastic.

D

Explanation:

Price elasticity of demand measures the responsiveness of quantity demanded to changes in price of the good.

Price elasticity of demand = percentage change in quantity demanded / percentage change in price  

Infinitely elastic demand is perfectly elastic demand. Demand falls to zero when price increases  

Perfectly inelastic demand is demand where there is no change in the quantity demanded regardless of changes in price.

Supply is perfectly inelastic if a small change in price has no effect on quantity supplied

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