New User Special Price Expires in

Let's log you in.

Sign in with Facebook


Don't have a StudySoup account? Create one here!


Create a StudySoup account

Be part of our community, it's free to join!

Sign up with Facebook


Create your account
By creating an account you agree to StudySoup's terms and conditions and privacy policy

Already have a StudySoup account? Login here

Microeconomics Elasticity Notes

Star Star Star Star
1 review
by: Jacquelyn McGee

Microeconomics Elasticity Notes Econ 22060-002

Marketplace > Kent State University > Economcs > Econ 22060-002 > Microeconomics Elasticity Notes
Jacquelyn McGee

Preview These Notes for FREE

Get a free preview of these Notes, just enter your email below.

Unlock Preview
Unlock Preview

Preview these materials now for free

Why put in your email? Get access to more of this material and other relevant free materials for your school

View Preview

About this Document

These notes cover supply elasticity and demand elasticity with some examples. The equations for both the supply and demand sides of elasticity are also in the notes along with other helpful notes t...
Jeremiah Harris
Class Notes
Microeconomics, elasticity, supply, demand, Revenue
25 ?




Star Star Star Star
1 review
Star Star Star Star
Sarah Cross

Popular in Microeconomics

Popular in Economcs

This 4 page Class Notes was uploaded by Jacquelyn McGee on Wednesday February 3, 2016. The Class Notes belongs to Econ 22060-002 at Kent State University taught by Jeremiah Harris in Spring 2016. Since its upload, it has received 36 views. For similar materials see Microeconomics in Economcs at Kent State University.


Reviews for Microeconomics Elasticity Notes

Star Star Star Star

-Sarah Cross


Report this Material


What is Karma?


Karma is the currency of StudySoup.

You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 02/03/16
Elasticity 2/8/16 &2/10/16 Elasticity Definition: elasticity is the measure of responsiveness o For example if you change price, how does the quantity demanded respond  Slope=ΔP/ΔQ=$/Product(ex. Pizzas) Price of Elasticity of Demand Definition: a measure of the responsiveness of quantity demanded to a price change. o The slope of the line will be price over quantity (Slope=P/Q); but the slope doesn’t work because the slope will always be based on the unit of measure. o This will result in an invalid comparison of different goods  We want a measurement that is independent of the units of measurement The units of Measure vary so “unit-free” measure is needs- Use percentage changes for price and Quantity demanded o %ΔQd/%ΔP Price elasticity of demand=(εd)=|%ΔQd/%ΔP|**** this formula is important o Always positive because of the absolute value There are 3 ranges for Price elasticity of demand o εd>1  |%ΔQd/%ΔP|>1  |% ΔQd|>|%ΔP|  “elastic” Demand o εd<1  |%ΔQd/%ΔP|<1  |% ΔQd|<|%ΔP|  “inelastic” Demand o εd=1  |%ΔQd/%ΔP|=1  |% ΔQd|=|%ΔP|  “unit elastic” Demand  Calculating the Percent changes o General definition: %ΔP2-P1/P1 or P1-P2/P2  Average Price Sum of P/2 o Base=Sum Qd/2=average Qd o Base=Sum P/2=average P o = = o Example P=-2QD+12  If P: $2  $4  Qd: 5  4  Is this elastic or inelastic?  Inelastic because the εd= 1/3 < 1 making it inelastic o Example P= 2QD+12  P: $5$7  Qd: 3.5 2.5  Unit elastic because εd=1  As the price rises, the demand becomes more elastic o Above midpoint of quantity  εd<1 o Below midpoint of quantity  εd>1 o Midpoint of quantity  εd=1 o Above midpoint of price  εd>1 o Below midpoint of price  εd<1 o Midpoint price  εd=1 Determinants of εd  Factors influence the elasticity of demand o Closeness of Substitutes  Lots of Substitutes  Demand more elastic  Fewer Substitutes  Demand less elastic  Example: Luxuries such as vacations generally have elastic demand and have lots of substitutes; where necessities such as food do not have many substitutes so they have inelastic demand. o The proportion of income that’s spent on the good  Small portion is less elastic/more inelastic  Large portion is more elastic/less inelastic  Example: small portion; consider a candy bar, a 50% increase in price does not change demand much. Large portion; consider the purchase of your first home, a 50%increase doesn’t change things much o Time elapsed since the price change  More time has demand that is more elastic  Less time has demand that is less elastic  The more consumers have to adjust/change a price, the more elastic is the demand for that/those goods Two Extremes in Elasticity  Perfectly Inelastic Demand (vertical line) o Example: Insulin, because when you need it you will pay whatever price you have to get what you need. (Absolutely have to have something so the price change doesn’t affect the consumer decision) o εd= =0  Perfectly elastic demand (horizontal) o Example: 2 pop machines with different prices at the same place; the consumer is more likely to choose the machine with the cheaper prices. o εd= =∞ Price Elasticity of Demand Cont.  Total Revenue and Elasticity o Total Revenue: equals the price of the good multiplied by the quantity sold from the sale of good or service o When the price changes, the total revenue also changes o But a rise in price doesn’t always increase total revenue  Total revenue is not the same as profit!  Revenue= P x Qd(Inelastic) o An increase in price causes a small decrease in Qd an increase in Revenue o A decrease in price leads to a small increase in Qd and a decrease in Revenue o When εd<1 the revenue follows the P change; when price goes up revenue goes up, when price goes down revenue goes down  εd<1 |%ΔQd|>|%ΔP| (Elastic) o |%ΔQd| drives Revenue  An increase in price causes a big drop in Qd and a decrease in Revenue  A decrease in price causes a large increase in Qd and an increase in revenue Cross-price Elasticity of Demand  Cross-price elasticity of demand: a measure of the responsiveness of demand for a good to a change in price of a substitute or a compliment, other things remaining the same o Cross-price elasticity=  Notice, there are different subscripts for good x and good y o Example: x=Nike; y=Adidas  Increase in price of Nike causes an increase in Qd of Adidas Income Elasticity of Demand  Income elasticity of demand: measures how the quantity demanded of a good responds to a change in income, other things remaining the same o Income elasticity= o Positive  normal good o Negative  inferior good Elasticity of Supply Elasticity of Supply: measures the responsiveness of the quantity supplied to change in the price of a good when all other influences on selling plans remain the same o εs= >0 o εs>1 elastic o εs<1 inelastic o εs=1 unit elastic Demand of εs  Availability of substitute inputs o Fewer substitute inputs  Less elasticity supply o More substitute inputs  More elastic supply  Time o More time more elastic supple o Less time less elastic supply


Buy Material

Are you sure you want to buy this material for

25 Karma

Buy Material

BOOM! Enjoy Your Free Notes!

We've added these Notes to your profile, click here to view them now.


You're already Subscribed!

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

Why people love StudySoup

Jim McGreen Ohio University

"Knowing I can count on the Elite Notetaker in my class allows me to focus on what the professor is saying instead of just scribbling notes the whole time and falling behind."

Anthony Lee UC Santa Barbara

"I bought an awesome study guide, which helped me get an A in my Math 34B class this quarter!"

Bentley McCaw University of Florida

"I was shooting for a perfect 4.0 GPA this semester. Having StudySoup as a study aid was critical to helping me achieve my goal...and I nailed it!"


"Their 'Elite Notetakers' are making over $1,200/month in sales by creating high quality content that helps their classmates in a time of need."

Become an Elite Notetaker and start selling your notes online!

Refund Policy


All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email


StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here:

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.