Explain the Arc Method of Measurement of Elasticity
Explain the Arc Method of Measurement of Elasticity.
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Arc Method: the Geometric or point method is applicable only while there are minute (very small) variation in price and demand. But, Arc elasticity measures elasticity among two points. This is a measure of the average elasticity in words of Watson that Arc elasticity is the elasticity upon the mid-point of demand curve arc. Formulate measure elasticity is as illustrates below:
ED = ?Q/ ?P × (P1+P2)/ (Q1+Q2) or
(Change in D/ Average D) x (Average P/Change in P).
Here, ?Q= change in quantity
Q1= original quantity
P1 = original price
Q2= new quantity
P2 = New price and
?P= change in price.
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