1.

When the price of a good changes to Rs. 11 per unit, the consumer's demand falls from 11 units to 7 units. The price elasticity of demand is (-) 1. What was the price before change ? Use expenditure approach of price elasticity of demand to answer this question.

Answer»

Solution :Given that TOTAL expenditure after the CHANGE in price `=P XX Q=11xx7=Rs. 77`.
When EP `=[-1]` and price is different,total expenditure remains unchanged at Rs. 77.
Price before change `=77//11 = Rs. 7` per UNIT.


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