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Managerial Economics

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Chapter 3 Quantitative Demand Analysis
Overview
. The Elasticity Concept
Own Price Elasticity Elasticity and Total Revenue Cross-Price Elasticity Income Elasticity
II. Demand Functions
Linear Log-Linear
III. Regression Analysis
The Elasticity Concept
How responsive is variable “G” to a change in variable “S”

If EG,S > 0, then S and G are directly related.
If EG,S < 0, then S and G are inversely related
If EG,S = 0, then S and G are unrelated
The Elasticity Concept Using Calculus
An alternative way to measure the elasticity of a function G = f(S) is

If EG,S > 0, then S and G are directly related If EG,S < 0, then S and G are inversely related
If EG,S = 0, then S and G are unrelated
Own Price Elasticity of Demand

Perfectly Elastic & Inelastic Demand
Own-Price Elasticity and Total Revenue
Elastic Increase (a decrease) in price leads to a decrease (an increase) in total revenue.
Inelastic Increase (a decrease) in price leads to an increase (a decrease) in total revenue.
Unitary Total revenue is maximized at the point where demand is unitary elastic
Elasticity, Total Revenue and Linear Demand show graph
Elasticity, Total Revenue and Linear Demand show graph
Elasticity, Total Revenue and Linear Demand show graph
Elasticity, Total Revenue and Linear Demand show graph
Elasticity, Total Revenue and Linear Demand show graph
Elasticity, Total Revenue and Linear Demand show graph
Elasticity, Total Revenue and Linear Demand show graph
Demand, Marginal Revenue (MR) and Elasticity show graph
Factors Affecting the Own-Price Elasticity
Available Substitutes The more substitutes available for the good, the more elastic the demand.
Time Demand tends to be more inelastic in the short term than in the long term.
Time allows consumers to seek out available substitutes.

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