Q1) Price elasticity of Demand = % change in Quantity/ %change in price.
% change in Quantity from year 1980 to 1982= -9.36
% change in Price from year 1980 to 1982= 146.67
Price elasticity of Demand for crude oil between 1980 and 1982 = -9.36/146.67= -0.06
Crude oil demand is inelastic.
Q2) % change in Price= 0.89
% change in Quantity = % change in price× price elasticity of demand
% change in Quantity= 0.89× -0.06= -0.0534
Now initial quantity= 58 million barrels per day
Let final quantity ne denoted as QF
Now, % change in Quantity = {(QF-58)÷58} × 100
-0.0534= {(QF-58)÷58} × 100, Solving equation for QF,
We get QF= 57.97
Crude oil consumed daily in 2017 globally was 57.97 million barrels
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