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arc elasticity

N

neha.neu

Member
if the demand curve of the commodity x is q=20-2p

Calculate the demand elsticity when price rises from 1 to 2?

the answer says -(1/4)

while my answer is -.17:(
 
Are you sure it wasn't a price fall from 2 to 1? Then the answer would be -0.25.
 
yeah am sure. true if its a fall the point elasticity would be -.25 but the arc elasticity would still remain the same. how do we know which method to use?
 
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