- CFA Exams
- 2021 CFA Level I Exam
- Study Session 4. Economics (1)
- Reading 12. Topics in Demand and Supply Analysis
- Subject 2. Elasticities of Demand

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**CFA Practice Question**

If the price elasticity of demand is 0.3, then a 20% increase in price will ______ the quantity demanded by ______ %.

B. decrease; 6.0

C. decrease; 1.5

A. increase; 20.3

B. decrease; 6.0

C. decrease; 1.5

Correct Answer: B

The price elasticity of demand is E = %change in quantity/ % change in price. Since demand curves are downward-sloping, this is a negative number. Economists, however, use the absolute value of the % change in quantity.

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**User Contributed Comments**
11

User |
Comment |
---|---|

soarer1 |
How do you calculate this? |

yael |
Elasticity = % change in quantity/% change in price E = .3 if % change in price = 20% % change in quantity = 20% x .3 % change in quantity = 6% |

TUFF |
if PED=0.3 and %change in qty is 20% or 0.20 therefore there would be a 6% or 0.06 [0.20 *0.3]fall in price. |

smartinski |
Lets say that I sell Bread at $1 and then I raise the price by 50%. Does that mean that demand will decrease by 50%? |

odette |
well, maybe |

vanillarice |
Depends on the elasticity coefficient of bread at that price. |

wulin |
Easiest calculation question in the whole book. |

supperbee |
This is howis reasoned: 1% change in price leads to a .3% change in qty demanded.if price changes by 6% qty demanded changes by? |

MRSLETS |
I used the formula for price elasticiy and Basic mathematics X= Change in gty dd x/0.20=0.30 x=0.30*0.20(cross multiply) x=0.06 x=6% Since price elasticity is less than one,it will be a decrease with 6% |

bundy |
% change in Q / % change in P = .3 so .3 x .20 = .06 X 100 = 6 |

bidisha |
thanks superbee |