1.

A consumer buys 14 units of a good at a price of Rs. 8 per unit. At price Rs. 7 per unit he spends Rs. 98 on the good. Calculate price elasticity of demand by the percentage method. Comment upon the shape of demand curve based on this information.

Answer»

Solution :`{:("INITIAL Price (P) = 8","Initial Expenditure = 112","Initial Quantity (Q) = 14"),("New Price "(P_(1))=7,"New Expenditure = 98","New Quantity "(Q_(1))),(,,=("EXP.")/("Price")=(98)/(7)=14),(Delta P=(-)1,,Delta Q=0):}`
`PED=(Delta Q)/(Delta P)xx(P)/(Q)=(0)/((-)1)xx(8)/(14)=0`
ED is perfectly inelastic as quantity DEMANDED does not CHANGE at all in response to change in price. Thus, its demand curve will be vertical/parallel to y-axis.


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