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Identify the correct statement regarding the supply of a given commodity.

Solution

✅ Correct Option: 3

Price elasticity of supply is a ratio of percentage changes, so it is a pure number independent of the units in which price and quantity are measured; option 3 is correct. A vertical supply curve means supply is completely insensitive to price, a unit tax shifts the supply curve leftward (upward), and technological progress shifts it rightward.

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