ECON1101 Study Guide - Final Guide: Price Ceiling, Price Elasticity Of Demand, Economic Equilibrium

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16 May 2018
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Elasticities
Price Controls
Price controls - a gov. law or regulation that sets or limits the price to be charged for a
particular good.
Price ceiling - a legal maximum on the price of a good, eg: rent control.
For the price ceiling to bind and create shortage, it must be less than the equilibrium price.
Dealing with persistent shortages:
Causes rationing.
Black markets develop.
There could be a reduction in the quality of the good sold.
Price ceilings may not end up helping people that the policy was designed to benefit.
Price floor - a legal minimum on the price of a good, eg: minimum wage.
Enacted with the goal of helping producers who are facing low market equilibrium prices.
For floor price to bind and create surplus, it must be more than the equilibrium price.
Dealing with persistent surpluses:
If the minimum wage exceeds the equilibrium wage, the number of workers demanded at
that wage is less than the number of workers who are willing to work = surplus of
unemployed workers at the minimum wage.
May not end up helping people that the policy was designed to benefit.
Elasticity
o Elasticity how big or small the change in QD or QS is as a result of a price change.
Elasticity of Demand
Price elasticity of demand ((negative of the) % change in QD) divided by (% change in price).
Since the QD is negatively related to the price, the elasticity of demand is a negative number.
A given change in price has a larger impact on QD when the elasticity of demand is higher.
A given shift of the supply curve will have a larger impact on equilibrium quantity (and a
smaller impact on equilibrium price) when the elasticity of demand is higher.
Price elasticity of demand is a unit-free measure = provides a way to compare the price
sensitivity of demand of less expensive goods, like rice, with more expensive goods, like steak.
Determinants of size of demand elasticity:
Substitution possibilities - if a substitute is easily found, then the price elasticity will be high.
This depends on whether it is a necessity or a luxury.
Budget share - if a good represents a large fraction of people's income, then the price
elasticity will be high.
Temporary vs Permanent Price Change demand is more elastic for temporary compared to
permanent price change.
Time demand tends to be more price sensitive over time.
Income Elasticity and Cross-Price Elasticity of Demand
Cross-price elasticity of demand - % change QD of one good/% change in P of another good,
eg: an increase in P of rollerblades would increase QD of bicycles.
For substitutes, E>0
For compliments, E<0
Elasticity
Elasticity of Demand
“hape of Dead Curve
Perfectly inelastic
= 0
Vertical
Inelastic
< 1
Relatively steep
Unit elastic
= 1
Elastic
> 1
Relatively flat
Perfectly elastic
Infinite
Horizontal
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