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1. When tolls on the Dulles Airport Greenway were increased from $1.25 to $1.50,

ID: 2505936 • Letter: 1

Question

1. When tolls on the Dulles Airport Greenway were increased from $1.25 to $1.50, traffic decreased from 21,000 to 16,000 trips a day. Assuming all changes in quantity were due to the change in price, what is the price elasticity of demand for the Dulles Airport Greenway?


2. One football season Domino

When tolls on the Dulles Airport Greenway were increased from $1.25 to $1.50, traffic decreased from 21,000 to 16,000 trips a day. Assuming all changes in quantity were due to the change in price, what is the price elasticity of demand for the Dulles Airport Greenway?

Explanation / Answer

Ans.

The price elasticity of demand (PED) is calculated by diving the percentage change in quantity demanded by the percentage change in price.

percentage change in quantity demanded=(16000-21000)/21000=-5000/21000=-5/21

percentage change in price=(1.50-1.25)/1.25=1/5

PED=-5/21 / 1/5

=-25/21 = -1.19