5.2 Polar cases of elasticity and constant elasticity

 Page 1 / 11

By the end of this section, you will be able to:

• Differentiate between infinite and zero elasticity
• Analyze graphs in order to classify elasticity as constant unitary, infinite, or zero

There are two extreme cases of elasticity: when elasticity equals zero and when it is infinite. A third case is that of constant unitary elasticity. We will describe each case. Infinite elasticity or perfect elasticity    refers to the extreme case where either the quantity demanded (Qd) or supplied (Qs) changes by an infinite amount in response to any change in price at all. In both cases, the supply and the demand curve    are horizontal as shown in [link] . While perfectly elastic supply curves are unrealistic, goods with readily available inputs and whose production can be easily expanded will feature highly elastic supply curves. Examples include pizza, bread, books and pencils. Similarly, perfectly elastic demand is an extreme example. But luxury goods, goods that take a large share of individuals’ income, and goods with many substitutes are likely to have highly elastic demand curves. Examples of such goods are Caribbean cruises and sports vehicles.

Zero elasticity or perfect inelasticity    , as depicted in [link] refers to the extreme case in which a percentage change in price, no matter how large, results in zero change in quantity. While a perfectly inelastic supply is an extreme example, goods with limited supply of inputs are likely to feature highly inelastic supply curves. Examples include diamond rings or housing in prime locations such as apartments facing Central Park in New York City. Similarly, while perfectly inelastic demand is an extreme case, necessities with no close substitutes are likely to have highly inelastic demand curves. This is the case of life-saving drugs and gasoline.

Constant unitary elasticity , in either a supply or demand curve, occurs when a price change of one percent results in a quantity change of one percent. [link] shows a demand curve with constant unit elasticity. As we move down the demand curve from A to B, the price falls by 33% and quantity demanded rises by 33%; as you move from B to C, the price falls by 25% and the quantity demanded rises by 25%; as you move from C to D, the price falls by 16% and the quantity rises by 16%. Notice that in absolute value, the declines in price, as you step down the demand curve, are not identical. Instead, the price falls by \$3 from A to B, by a smaller amount of \$1.50 from B to C, and by a still smaller amount of \$0.75 from C to D. As a result, a demand curve with constant unitary elasticity moves from a steeper slope on the left and a flatter slope on the right—and a curved shape overall.

Unlike the demand curve with unitary elasticity, the supply curve with unitary elasticity is represented by a straight line. In moving up the supply curve from left to right, each increase in quantity of 30, from 90 to 120 to 150 to 180, is equal in absolute value. However, in percentage value, the steps are decreasing, from 33.3% to 25% to 16.7%, because the original quantity points in each percentage calculation are getting larger and larger, which expands the denominator in the elasticity calculation.

Consider the price changes moving up the supply curve in [link] . From points D to E to F and to G on the supply curve, each step of \$1.50 is the same in absolute value. However, if the price changes are measured in percentage change terms, they are also decreasing, from 33.3% to 25% to 16.7%, because the original price points in each percentage calculation are getting larger and larger in value. Along the constant unitary elasticity supply curve, the percentage quantity increases on the horizontal axis exactly match the percentage price increases on the vertical axis—so this supply curve has a constant unitary elasticity at all points.

Key concepts and summary

Infinite or perfect elasticity refers to the extreme case where either the quantity demanded or supplied changes by an infinite amount in response to any change in price at all. Zero elasticity refers to the extreme case in which a percentage change in price, no matter how large, results in zero change in quantity. Constant unitary elasticity in either a supply or demand curve refers to a situation where a price change of one percent results in a quantity change of one percent.

Problems

The supply of paintings by Leonardo Da Vinci, who painted the Mona Lisa and The Last Supper and died in 1519, is highly inelastic. Sketch a supply and demand diagram, paying attention to the appropriate elasticities, to illustrate that demand for these paintings will determine the price.

Say that a certain stadium for professional football has 70,000 seats. What is the shape of the supply curve for tickets to football games at that stadium? Explain.

When someone’s kidneys fail, the person needs to have medical treatment with a dialysis machine (unless or until they receive a kidney transplant) or they will die. Sketch a supply and demand diagram, paying attention to the appropriate elasticities, to illustrate that the supply of such dialysis machines will primarily determine the price.

what is marginal rate of transformation
difference between individual demand and market demand with illustrations.
what is market demand
kwagala
Is the total amount of goods and services that all consumers are willing and able to purchase...
Istar
zahid
What is the different between demand and supply?
Demand is a natural phenomenon by a person who wants a certain commodity , u can say The ablity to buy a certain commodity at a certain price is called demand
Wardan
supply is point of view from Supplier of certain commodity
Wardan
Thnks wardan sheikh
Mohamud
u can get help from Law of Demand which is When a price of certain commodity increases it's quantity demanded decreases and when the price of certain commodity decreases it's quantity demanded increases and vice versa
Wardan
and to understand supply u can understand by the help of law of supply which is when a price of certain commodity increases it's quantity supplies also increases and when price of certain commodity decreases it's quantity supplies also decreases and vice versa
Wardan
Wardan
hi
Christian
hello
Victory
what is point?
Asmatullah
pls it's quantity supplied not quantity supplies. tanx
PETER
Peter it's just typing error if u know better u should take initiatives and start helping people or u can just shut up
Wardan
What is the labour market?
Ruchi
Ruchi Shukla it's a big topic which contains several parts , u can understand a market where there are number of employees (skilled and semiskilled )
Wardan
describe the economic systems
kivumbi
ryt nice
Destiny
what is the cause of a country's population
Destiny
Destiny Abekah the cause Is fun ahahahaha
Wardan
Hi
Crahmaan
What is going here?
Crahmaan
Hi
Jacob
what is naxion shoks any 1 can explain please
Iftikhar
hello
Hydrammeh
impact of transport and communication for economic help me
Jacob
What is the formula for calculating elasticity
Change in Quantity/Change in price
Abdul
ok
Destiny
E=%∆ in Q/ %∆ in P
ashafa
what mean elasticity
Jimcaale
change in quantity divided by change in price
mukhtaar
ok
Abdul
price elasticity = Q2-Q1/Q2+Q1/2/ P2-P1/P2+P1/2
Wardan
second formula is change in q / change in p × Q(original)/ p (original)
Wardan
Elasticity is just a measurement of change influenced by change in price , income
Wardan
change quantity /change in price
Ayaan
ok
change in price change in quality
yes
Thomas
public economy vs public choice
cool n you
Godwin
nice
Saratu
thank God
Destiny
so wat is going on
Destiny
Saratu
Saratu
demand changes when the price of the commodies in the market increaaes
Destiny
amd vise veser
Destiny
thank you.
Saratu
same to u
Destiny
I need help with PED and PES
Price elasticity demand
Saratu
price elasticity supply
Saratu
What are the uses of stastitics in economic and business?
Statistics helps in analysing various economic problems such as inflation, unemployment etc by looking at numbers, trends over the years.
Samuel
it also helps in summarising mass data like income, consumption etc into measures like per capita income and per capita consumptions which are more explanatory of how an economy is performing.
Samuel
Statistics is a data interpretation tool used for collecting, classifying and analyzing data. It is an indispensable tool for an economist to understand various business and economic problems and formulate policies to tackle with them.
Samuel
Destiny
how is the firm know elasticity
What is margin?
Crahmaan
yes
Leela
i would like to know about GST rather
JNUI
i've gone through many articles related to GST. but my question is, earlier, when the amount of tax was so higher, who was the winner?
JNUI
and if the amount of tax is less, then somebody must be losing some money. so who is the loss maker
JNUI
also, what I don't understand properly is the 'input tax credit'. 🤔 and the e-way bill
JNUI
Gst is an essential Tax to boost up National income
Wardan
Gst isn't ever goes too high but in cases where there is a larger expectations on Sales revenue the gst increase and vice versa
Wardan
and yes it's the only time to make revenue for Central Government under some period and certain conditions u will learn
Wardan
yeah third one the Gst is low
Wardan
the central Government is responsible for such error to not be so prudent under those policies which are applied
Wardan
deductive and inductive
Mianosama
deductive and inductive are the parts of micro economics
Wardan
What are the key elements to consider when defining economics
Samuel
scarcity, means and end
Balogun
Samuel it is defined as study of house hold Management and money matters .
Wardan
scarcity is defined as the point where demand is greater than supply
Wardan
Use scarcity,means and end in your definition
Samuel
I really love this group
Samuel
Am new to economics and you guys are making it so interesting to study
Samuel
yup seems very interesting
Criminologist
Hahaha thanks buddy
Wardan
consider a market (where there are buyers and sellers ) situation , Let's make it funny to make u understand more easy that due to some political issues It is announced by the government that every store will be closed tomorrow , the citizens who are intelligent enough to predict consequences for it
Wardan
They will start buying more and more and due to those political issue some stores were closed and few were opened so at this point the demand for product or commodity (which people are willing to buy from stores) is greater than supply
Wardan
What is GDP
XORO
basic competitive model and the role of mechanism
explain the Adam Smith law of economics
critical use of tariffs and non tariffs on imports and exports.
Is harmful
amin
is good I guess
Audrey
it's very good
Godwin
why is the marginal curve u shaped
which of marginal curve?
begyere
marginal cost curve
jake
critical use of tariffs and non tariffs on exports and imports
Natukunda
what is the features of monopoly market? how it is different from monopolistic market?
Monpoly market is a merket where the are many buyers, but only one seller. Because of the product is unique, and price discremination will be there.
Crahmaan
so how is it different from monopolistic market as she is saying
Samuel
or it is the same thing
Samuel
it marvellous
thanks
Samuel
what is demand function
demand function is the mathematical representation of price and quantity demanded of goods and services at various prices at a given time .
King
Demand function is an equation which shows the mathematical relationship between the quantity demanded of a good and the values of the various determinants of demand.
Bon