Answer to Question #159061 in Macroeconomics for Desalegn Beyene

Question #159061

Qs=150+14P and demand function P= 16.875-0.0625Q with 10 number of sellers and buyers.

Find equilibrium price and quantity

Find price elasticity of demand and and supply at equilibrium price and quantity




1
Expert's answer
2021-01-28T06:53:59-0500

a)Let's first rearrange our demand function:


0.0625Q=16.875P,0.0625Q=16.875-P,Qd=27016P.Q_d=270-16P.


Let's find the equilibrium price and quantity. In the equilibrium, Qd=QsQ_d=Q_s and we can find the equilibrium price:


27016PE=150+14PE,270-16P_E =150+14P_E,30PE=120,30P_E=120,PE=$4.P_E=\$4.

Then, we can find the equilibrium quantity by substituting PEP_E into the equation for QdQ_d:


Qd=Qs=QE=270164=206.Q_d=Q_s=Q_E=270-16\cdot4=206.


b) Let's rewrite our equations for QdQ_d and QsQ_s in slope-intercept form:


P=16.8750.0625Qd,P=16.875-0.0625Q_d,P=0.071Qs10.71.P=0.071Q_s-10.71.

The price elasticity of demand can be found as follows:


Ed=(1slope)(PQd)=(1(0.0625))(4206)=0.31E_d=(\dfrac{-1}{slope})(\dfrac{P}{Q_d})=(\dfrac{-1}{(-0.0625)})(\dfrac{4}{206})=0.31

The price elasticity of supply can be found as follows:


Es=(1slope)(PQs)=(10.071)(4206)=0.27E_s=(\dfrac{1}{slope})(\dfrac{P}{Q_s})=(\dfrac{1}{0.071})(\dfrac{4}{206})=0.27

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