Fred's price elasticity of demand for milk is -2 at today's prices when we measure price in dollars and quantity of milk in quarts.If the price per quart of milk stays the same but we measure quantity of milk in gallons and price in dollars, then what will be the elasticity of demand for gallons of milk? (A gallon is four quarts.)

A) -1
B) -1/2
C) -8
D) -4
E) -2

Elasticity Of Demand

A measure of how much the quantity demanded of a good responds to a change in the price of that good, with higher elasticity indicating greater responsiveness.

Gallons

A unit of volume for liquid measure equal to four quarts, used in the US customary and British imperial systems.

Quarts

A unit of liquid volume measurement in the United States, equal to a quarter of a gallon or approximately 0.946 liters.