CHAPTER 4. The Theory of Individual Behavior
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1 CHAPTER 4 The Theory of Individual Behavior Copyright 2014 McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education.
2 Chapter Overview Chapter Outline Consumer behavior Constraints Budget constraint Changes in income Changes in prices Consumer equilibrium Comparative statics Price changes and consumer behavior Income changes and consumer behavior Income and substitution effects Applications of indifference curve analysis Choices by consumers Choices by workers and managers Relationship between indifference curves and demand curves Individual demand Market demand 4-2
3 Introduction Chapter Overview Chapter 3 focused on quantitatively measuring demand. By how much will a 5 percent increase in price reduce quantity demanded? By how much will a 3 percent decline in income reduce demand for a normal good? This chapter examines the theory of consumer behavior that underlies individual and market demand curves. 4-3
4 Consumer Behavior Consumer Behavior Consumer opportunities Set of possible goods and services consumers can afford to consume. Consumer preferences Determine which set goods and services will be consumed. 4-4
5 Consumer Behavior Properties of Consumer Preferences Completeness: For any two bundles of goods either: AA BB. BB AA. AA BB. More is better If bundle AA has at least as much of every good as bundle BB and more of some good, bundle AA is preferred to bundle BB. Diminishing marginal rate of substitution As a consumer obtains more of good X, the amount of good Y the individual is willing to give up to obtain another unit of good X decreases. Transitivity: For any three bundles, AA, BB, and CC, either: If AA BB and BB CC, then AA CC. If AA BB and BB CC, then AA CC. 4-5
6 Constraints Constraints While any decision-making environment faces a host of constraints, the focus of managerial economics is to examine the role prices and income play in constraining consumer behavior. 4-6
7 Constraints Budget constraint The Budget Constraint Restriction set by prices and income that limits bundles of goods affordable to consumers. Budget set: PP XX XX + YY MM Budget line PP XX XX + YY = MM 4-7
8 Constraints The Budget Constraint In Action Good YY MM Slope PP XX Bundle H Budget set: YY MM PP XX XX Budget line: YY = MM PP XX XX Bundle G 0 MM PP XX Good XX 4-8
9 Constraints The Market Rate of Substitution Good YY 5 4 Market rate of substitution : = 1 2 Budget line: YY = XX Good XX 4-9
10 Constraints Income Changes Good YY MM 1 MM 0 MM 2 MM MM 0 MM 2 MM 0 MM 1 Good XX 4-10
11 Price Changes Constraints Good YY MM PP XX 0 > PP XX 1 Initial budget line New budget line 0 MM PP XX 0 MM PP XX 1 Good XX 4-11
12 The Budget Constraint in Action Consider the following budget line: 100 = 1XX + 5YY What is the maximum amount of X that can be consumed? What is the maximum amount of Y that can be consumed? What is rate at which the market trades goods X and Y? Constraints 4-12
13 The Budget Constraint in Action Answers: Maximum X is: XX = Maximum Y is: YY = = 100 units. = 20 units. Market rate of substitution: PP XX = 1 5. Constraints 4-13
14 Consumer Equilibrium Consumer equilibrium Consumption bundle that is affordable and yields the greatest satisfaction to the consumer. Consumption bundle where the rate a consumer choses (marginal rate of substitution) to trade between goods X and Y equals the rate at which these goods are traded in the market (market rate of substitution). MMMMMM = PP XX Consumer Equilibrium 4-14
15 Consumer Equilibrium Consumer Equilibrium in Action Good YY D A B Consumer equilibrium C I II III 0 Good XX 4-15
16 Consumer Equilibrium in Action Consider the following consumer market information: MMMMMM = 2. Consumer Equilibrium PP XX = 4. Does this information constitute a consumer equilibrium? No! Propose a solution to bring the consumer to an equilibrium point. Trade consumption of X for more Y. Total utility can increase. 4-16
17 Comparative Statics Comparative Statics Price and income changes impact a consumer s budget set and level of satisfaction that can be achieved. This implies that price and income changes will lead to consumer equilibrium changes. This section explores how price and income changes impact consumer equilibrium. 4-17
18 Comparative Statics Price Changes and Consumer Equilibrium Price increases (decreases) reduce (expand) a consumer s budget set. The new consumer equilibrium resulting from a price change depends on consumer preferences: Goods X and Y are: substitutes when an increase (decrease) in the price of X leads to an increase (decrease) in the consumption of Y. complements when an increase (decrease) in the price of X leads to a decrease (increase) in the consumption of Y. 4-18
19 Good YY Price Changes and Consumer Equilibrium in Action Comparative Statics MM YY 0 A B Point A: Initial consumer equilibrium Price of good X decreases: PP XX Point B: New consumer equilibrium Since YY 1 < YY 0 when PP XX : Conclude that goods XX and YY are substitutes YY 1 I II 0 XX 0 MM PP XX 0 XX 1 MM PP XX 1 Good XX 4-19
20 Income Changes and Consumer Equilibrium Income increases (decreases) expands (reduces) a consumer s budget set. The new consumer equilibrium resulting from an income change depends on consumer preferences: Good X is: Comparative Statics a normal good when an increase (decrease) in income leads to an increase (decrease) in the consumption of X. an inferior good when an increase (decrease) in income leads to a decrease (increase) in the consumption of X. 4-20
21 Income Changes and Consumer Equilibrium in Action Comparative Statics Good YY MM 1 MM 0 B Point A: Initial consumer equilibrium Income increases: MM Point B: New consumer equilibrium Since more of both goods are consumed when MM : Conclude that goods XX and YY are normal goods. A II I 0 MM 0 PP XX MM 1 PP XX Good XX 4-21
22 Comparative Statics Substitutions and Income Effects Moving from one equilibrium to another when the price of one good changes can be broken down into two effects: Substitution effect Income effect 4-22
23 Comparative Statics Substitution and Income Effects in Action Good YY J F B Point A: Initial consumer equilibrium Price of good X increases: PP XX Point C: new consumer equilibrium XX MM - XX 0 : substitution effect XX 1 - XX MM : income effect C A H 0 XX 1 XX MM XX 0 I G Good XX Income effect Substitution effect 4-23
24 Applications of Indifference Curves Consumer Choice with a Gift Certificate Good Y MM 0 YY 2 A C Point A: Initial consumer equilibrium Receive a $10 gift certificate for good XX: MM + $10 Point B: higher utility holding YY consumption at initial level Point C: new consumer equilibrium when XXand YY are normal goods YY 1 B II I 0 XX 1 XX 2 MM 0 PP XX MM 0 + $10 PP XX Good X 4-24
25 Applications of Indifference Curves Labor-Leisure Choice Model Income (per day) I II III $240 $80 E Worker equilibrium hours of leisure 8 hours of work Leisure (hours per day) 4-25
26 Applications of Indifference Curves Labor-Leisure Budget Set in Action What is the budget set for a worker who receives $7 per hour of work and a fixed payment of $70? Let EE denote the worker s total earnings and LL the number of leisure hours in a 24-hour day. EE = $ LL = 238 7L 4-26
27 The Relationship Between Indifference Curve Analysis and Demand Curves Indifference and Demand Curves The indifference curves and consumers reactions to changes in prices and income are the basis of the demand functions in chapters 2 and
28 The Relationship Between Indifference Curve Analysis and Demand Curves From Indifference Curves to Individual Demand Good YY Price of good XX PP XX1 A B PP XX2 I II Demand 0 XX 1 XX 2 Good XX XX 1 XX 2 Good XX 4-28
29 Price of good XX $60 Price of good XX The Relationship Between Indifference Curve Analysis and Demand Curves From Individual to Market Demand $40 A B A B A+B Demand mkt Demand A Demand B Good XX Good XX 4-29
30 Conclusion Indifference curve properties reveal information about consumers preferences between bundles of goods. Completeness More is better Diminishing rate of substitution Transitivity Indifference curves along with price changes determine individuals demand curves. Market demand is the horizontal summation of individuals demands. 4-30
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