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Question
A 10% increase in the price of a good causes a 10% decrease in quantity supplied. The supply curve is a _______.
Options:
A .  straight line passing through the origin
B .  straight line not passing through the origin
C .  straight line parallel to the x-axis
D .  rectangular hyperbola
Answer: Option A
:
A
ϵs=% change in quantity% change in price=1010=1
Unit elastic supply curves are straightlines passing through the origin.

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