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# 8 units of a good are demanded at a price of Rs 7 per unit. Price elasticity of demand is (−) 1. How many units will be demanded if the price rises to Rs 8 per unit? - Economics

#### Question

8 units of a good are demanded at a price of Rs 7 per unit. Price elasticity of demand is (−) 1. How many units will be demanded if the price rises to Rs 8 per unit? Use expenditure approach of price elasticity of demand to answer this question.

#### Solution

Given:

Initial Quantity Demanded=8units

Initial Price= Rs 7

We know,

"Total Expenditure"="Price"xx"Quantity"

⇒ Initial Total Expenditure=7xx8

Or , Inittial Total Expenditue=Rs 56

Since, E_d=1, this implies that total expenditure after price rises to Rs 8 remains the same

⇒ Final Total Expenditure= Rs 56

Or,56=8xx"Quantity"'=7"units"

Thus , When the price rises to Rs 8, the qunatity demanded falls to 7 units.

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