GCEEconomicsElasticity2019

The supply of a commodity is said to be perfectly elastic when

Aa small rise in price leads to an infinitely large increase in quantity suppliedCORRECT
Bquantity supplied does not change regardless of price changes
Cthe percentage change in quantity supplied equals the percentage change in price
Da large rise in price leads to no change in quantity supplied
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Why the answer is A, and why the others tempt you.
Perfectly elastic supply (PES = ∞) means that at the prevailing price, suppliers are willing to supply any quantity, but even the slightest fall in price would cause supply to drop to zero. This is represented by a horizontal supply curve. Option B describes perfectly inelastic supply, and option C describes unitary elastic supply.
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