Topic 3 Flashcards
Impacts on Elasticity
- Availability of substitutes (key determinant)
- Time horizon (time to adapt to price changes)
- Narrowness of product category (specific or broad, Nurafen vs ibuprofen)
- Necessities vs Luxuries
- Purchase Impact (impact on budget)
Elasticity of Demand: Purpose
Measure responsiveness to:
- Good’s own price
- Other goods prices
- People’s income
Elasticity of Demand: Formula
Elasticity = (% change in Quantity Demanded) / (% change in Price)
Inelastic Demand Curve
- < 1 (or less than -1)
- Steeper Demand Curve
Elastic Demand Curve
- > 1 (or greater than -1)
- Flatter demand curve
Unit Elastic Demand Curve
- = 1
- 45 degree gradient
Elasticity Midpoint Forumula
Revenue Impact from from Price move when Elasticity is < 1
Price and Revenue Move Together
Revenue Impact from from Price move when Elasticity is > 1
Price and Revenue Move in Opposition
Revenue Impact from from Price move when Elasticity is = 1
Price moves but Revenue stays the same
Point Elasticity vs Arc Elasticity
- Point: % change at a single point
- ie (Q1-Q2/Q2 …)
- Arc: uses midpoint formula
- ie (Q1-Q2/Avg(Q1+Q2) …)
Elasticity Along a Straight Line Demand Curve
Cross-price elasticity
% change in quantity demanded of A / % change in price of B
Income Elasticity of Demand
% change in quantity demanded / % change in income
Types of good
- Normal
- Inferior
- Luxury
Normal Good
-
Positive income elasticity of demand
- Increase in income -> increase in quantity demanded
Inferior Good
-
Negative income elasticity of demand
- Increase in income -> decrease in quantity demanded
Luxury Good
-
Positive income elasticity of demand, > 1
- Increase in income -> increase in quantity demanded
Network Effects
For some goods or services the benefit is proportional to the number of other customers
* eg. two-sided market platform
* User content based platform (eg instagram)
* Review based platform (eg. trip advisor)
Infinitely / Perfectly Elastic Curve
Perfectly Inelastic Curve
Continuously Elastic Curve
Cross Elasticity of Demand - Goods Relationships
- Substitutes - CED is Positive
- Complements - CED is Negative
- Unrelated - CED = 0
Profit Maximising Pricing Formula
( Price - Marginal Cost) / Price = 1/Elasticity.