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**Choice Under Uncertainty**

Chapter 5 Choice Under Uncertainty 1

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**Topics to be Discussed Describing Risk Preferences Toward Risk**

Reducing Risk The Demand for Risky Assets Chapter 5 2

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**Introduction Choice with certainty is reasonably straightforward.**

How do we choose when certain variables such as income and prices are uncertain (i.e. making choices with risk)? Chapter 5 3

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**Describing Risk To measure risk we must know:**

1) All of the possible outcomes. 2) The likelihood that each outcome will occur (its probability). Chapter 5 4

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**Describing Risk Interpreting Probability**

The likelihood that a given outcome will occur Chapter 5 5

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**Describing Risk Interpreting Probability Objective Interpretation**

Based on the observed frequency of past events Chapter 5 5

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**Describing Risk Interpreting Probability Subjective**

Based on perception or experience with or without an observed frequency Different information or different abilities to process the same information can influence the subjective probability Chapter 5 6

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**Describing Risk Expected Value**

The weighted average of the payoffs or values resulting from all possible outcomes. The probabilities of each outcome are used as weights Expected value measures the central tendency; the payoff or value expected on average Chapter 5 7

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**Describing Risk An Example**

Investment in offshore drilling exploration: Two outcomes are possible Success -- the stock price increase from $30 to $40/share Failure -- the stock price falls from $30 to $20/share Chapter 5 8

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**Describing Risk An Example Objective Probability**

100 explorations, 25 successes and 75 failures Probability (Pr) of success = 1/4 and the probability of failure = 3/4 Chapter 5 9

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Describing Risk Expected Value (EV) An Example: Chapter 5 10

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**Describing Risk Given: Two possible outcomes having payoffs X1 and X2**

Probabilities of each outcome is given by Pr1 & Pr2 Chapter 5 11

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Describing Risk Generally, expected value is written as: Chapter 5 11

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**Describing Risk Variability**

The extent to which possible outcomes of an uncertain even may differ Chapter 5 12

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**Describing Risk A Scenario Variability**

Suppose you are choosing between two part-time sales jobs that have the same expected income ($1,500) The first job is based entirely on commission. The second is a salaried position. Chapter 5 12

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**Describing Risk A Scenario Variability**

There are two equally likely outcomes in the first job--$2,000 for a good sales job and $1,000 for a modestly successful one. The second pays $1,510 most of the time (.99 probability), but you will earn $510 if the company goes out of business (.01 probability). Chapter 5 13

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**Describing Risk Income from Sales Jobs Outcome 1 Outcome 2 Expected**

Probability Income ($) Probability Income ($) Income Job 1: Commission Job 2: Fixed salary Chapter 5 14

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**Describing Risk Income from Sales Jobs Job 1 Expected Income**

Chapter 5 15

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Describing Risk While the expected values are the same, the variability is not. Greater variability from expected values signals greater risk. Deviation Difference between expected payoff and actual payoff Chapter 5 16

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**Deviations from Expected Income ($)**

Describing Risk Deviations from Expected Income ($) Outcome 1 Deviation Outcome 2 Deviation Job 1 $2,000 $500 $1,000 -$500 Job 2 1, Chapter 5 17

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**Describing Risk Adjusting for negative numbers**

Variability Adjusting for negative numbers The standard deviation measures the square root of the average of the squares of the deviations of the payoffs associated with each outcome from their expected value. Chapter 5 19

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**Describing Risk The standard deviation is written: Variability**

Chapter 5 20

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**Calculating Variance ($)**

Describing Risk Calculating Variance ($) Deviation Deviation Deviation Standard Outcome 1 Squared Outcome 2 Squared Squared Deviation Job 1 $2,000 $250,000 $1, $250, $250, $500.00 Job 2 1, , , Chapter 5 21

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**Describing Risk The standard deviations of the two jobs are:**

*Greater Risk Chapter 5 22

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Describing Risk The standard deviation can be used when there are many outcomes instead of only two. Chapter 5 23

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Describing Risk Example Job 1 is a job in which the income ranges from $1000 to $2000 in increments of $100 that are all equally likely. Chapter 5 24

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Describing Risk Example Job 2 is a job in which the income ranges from $1300 to $1700 in increments of $100 that, also, are all equally likely. Chapter 5 24

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**Outcome Probabilities for Two Jobs**

Job 1 has greater spread: greater standard deviation and greater risk than Job 2. Probability 0.2 0.1 Job 1 Income $1000 $1500 $2000 Chapter 5 27

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Describing Risk Outcome Probabilities of Two Jobs (unequal probability of outcomes) Job 1: greater spread & standard deviation Peaked distribution: extreme payoffs are less likely Chapter 5 28

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**Describing Risk Decision Making**

A risk avoider would choose Job 2: same expected income as Job 1 with less risk. Suppose we add $100 to each payoff in Job 1 which makes the expected payoff = $1600. Chapter 5 28

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**Unequal Probability Outcomes**

Job 2 The distribution of payoffs associated with Job 1 has a greater spread and standard deviation than those with Job 2. 0.2 0.1 Job 1 Income $1000 $1500 $2000 Chapter 5 33

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**Income from Sales Jobs--Modified ($)**

Deviation Deviation Expected Standard Outcome 1 Squared Outcome 2 Squared Income Deviation Job 1 $2,100 $250,000 $1,100 $250,000 $1,600 $500 Job ,100 1, Recall: The standard deviation is the square root of the deviation squared. Chapter 5 29

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Describing Risk Decision Making Job 1: expected income $1,600 and a standard deviation of $500. Job 2: expected income of $1,500 and a standard deviation of $99.50 Which job? Greater value or less risk? Chapter 5 30

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Describing Risk Example Suppose a city wants to deter people from double parking. The alternatives …... Chapter 5 63

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**Describing Risk Assumptions:**

Example Assumptions: 1) Double-parking saves a person $5 in terms of time spent searching for a parking space. 2) The driver is risk neutral. 3) Cost of apprehension is zero. Chapter 5 64

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Describing Risk Example A fine of $5.01 would deter the driver from double parking. Benefit of double parking ($5) is less than the cost ($5.01) equals a net benefit that is less than 0. Chapter 5 65

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**Describing Risk Increasing the fine can reduce enforcement cost:**

Example Increasing the fine can reduce enforcement cost: A $50 fine with a .1 probability of being caught results in an expected penalty of $5. A $500 fine with a .01 probability of being caught results in an expected penalty of $5. Chapter 5 66

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Describing Risk Example The more risk averse drivers are, the lower the fine needs to be in order to be effective. Chapter 5 66

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**Preferences Toward Risk**

Choosing Among Risky Alternatives Assume Consumption of a single commodity The consumer knows all probabilities Payoffs measured in terms of utility Utility function given Chapter 5 34

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**Preferences Toward Risk**

Example A person is earning $15,000 and receiving 13 units of utility from the job. She is considering a new, but risky job. Chapter 5 35

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**Preferences Toward Risk**

Example She has a .50 chance of increasing her income to $30,000 and a .50 chance of decreasing her income to $10,000. She will evaluate the position by calculating the expected value (utility) of the resulting income. Chapter 5 35

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**Preferences Toward Risk**

Example The expected utility of the new position is the sum of the utilities associated with all her possible incomes weighted by the probability that each income will occur. Chapter 5 36

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**Preferences Toward Risk**

Example The expected utility can be written: E(u) = (1/2)u($10,000) + (1/2)u($30,000) = 0.5(10) + 0.5(18) = 14 E(u) of new job is 14 which is greater than the current utility of 13 and therefore preferred. Chapter 5 37

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**Preferences Toward Risk**

Different Preferences Toward Risk People can be risk averse, risk neutral, or risk loving. Chapter 5 38

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**Preferences Toward Risk**

Different Preferences Toward Risk Risk Averse: A person who prefers a certain given income to a risky income with the same expected value. A person is considered risk averse if they have a diminishing marginal utility of income The use of insurance demonstrates risk aversive behavior. Chapter 5 39

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**Preferences Toward Risk**

Risk Averse A Scenario A person can have a $20,000 job with 100% probability and receive a utility level of 16. The person could have a job with a .5 chance of earning $30,000 and a .5 chance of earning $10,000. Chapter 5 40

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**Preferences Toward Risk**

Risk Averse Expected Income = (0.5)($30,000) (0.5)($10,000) = $20,000 Chapter 5 40

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**Preferences Toward Risk**

Risk Averse Expected income from both jobs is the same -- risk averse may choose current job Chapter 5 40

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**Preferences Toward Risk**

Risk Averse The expected utility from the new job is found: E(u) = (1/2)u ($10,000) + (1/2)u($30,000) E(u) = (0.5)(10) + (0.5)(18) = 14 E(u) of Job 1 is 16 which is greater than the E(u) of Job 2 which is 14. Chapter 5 43

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**Preferences Toward Risk**

Risk Averse This individual would keep their present job since it provides them with more utility than the risky job. They are said to be risk averse. Chapter 5 44

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**Preferences Toward Risk**

Risk Averse Utility The consumer is risk averse because she would prefer a certain income of $20,000 to a gamble with a .5 probability of $10,000 and a .5 probability of $30,000. E 10 15 20 13 14 16 18 30 A B C D Income ($1,000) Chapter 5 46

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**Preferences Toward Risk**

Risk Neutral A person is said to be risk neutral if they show no preference between a certain income, and an uncertain one with the same expected value. Chapter 5 47

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**Preferences Toward Risk**

Risk Neutral 6 A E C 12 18 The consumer is risk neutral and is indifferent between certain events and uncertain events with the same expected income. Utility Income ($1,000) 10 20 30 Chapter 5 49

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**Preferences Toward Risk**

Risk Loving A person is said to be risk loving if they show a preference toward an uncertain income over a certain income with the same expected value. Examples: Gambling, some criminal activity Chapter 5 50

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**Preferences Toward Risk**

Risk Loving Utility 3 10 20 30 A E C 8 18 The consumer is risk loving because she would prefer the gamble to a certain income. Income ($1,000) Chapter 5 52

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**Preferences Toward Risk**

Risk Premium The risk premium is the amount of money that a risk-averse person would pay to avoid taking a risk. Chapter 5 53

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**Preferences Toward Risk**

Risk Premium A Scenario The person has a .5 probability of earning $30,000 and a .5 probability of earning $10,000 (expected income = $20,000). The expected utility of these two outcomes can be found: E(u) = .5(18) + .5(10) = 14 Chapter 5 54

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**Preferences Toward Risk**

Risk Premium Question How much would the person pay to avoid risk? Chapter 5 54

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**Preferences Toward Risk**

Risk Premium 10 16 Here , the risk premium is $4,000 because a certain income of $16,000 gives the person the same expected utility as the uncertain income that has an expected value of $20,000. 18 30 40 20 14 A C E G F Risk Premium Utility Income ($1,000) Chapter 5 57

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**Preferences Toward Risk**

Risk Aversion and Income Variability in potential payoffs increase the risk premium. Example: A job has a .5 probability of paying $40,000 (utility of 20) and a .5 chance of paying 0 (utility of 0). Chapter 5 58

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**Preferences Toward Risk**

Risk Aversion and Income Example: The expected income is still $20,000, but the expected utility falls to 10. Expected utility = .5u($) + .5u($40,000) = (20) = 10 Chapter 5 58

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**Preferences Toward Risk**

Risk Aversion and Income Example: The certain income of $20,000 has a utility of 16. If the person is required to take the new position, their utility will fall by 6. Chapter 5 59

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**Preferences Toward Risk**

Risk Aversion and Income Example: The risk premium is $10,000 (i.e. they would be willing to give up $10,000 of the $20,000 and have the same E(u) as the risky job. Chapter 5 59

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**Preferences Toward Risk**

Risk Aversion and Income Therefore, it can be said that the greater the variability, the greater the risk premium. Chapter 5 60

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**Preferences Toward Risk**

Indifference Curve Combinations of expected income & standard deviation of income that yield the same utility Chapter 5 60

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**Risk Aversion and Indifference Curves**

Highly Risk Averse:An increase in standard deviation requires a large increase in income to maintain satisfaction. U1 U2 U3 Expected Income Standard Deviation of Income Chapter 5

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**Risk Aversion and Indifference Curves**

Expected Income Slightly Risk Averse: A large increase in standard deviation requires only a small increase in income to maintain satisfaction. U1 U2 U3 Standard Deviation of Income Chapter 5

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**Business Executives and the Choice of Risk**

Example Study of 464 executives found that: 20% were risk neutral 40% were risk takers 20% were risk adverse 20% did not respond Chapter 5 61

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**Business Executives and the Choice of Risk**

Example Those who liked risky situations did so when losses were involved. When risks involved gains the same, executives opted for less risky situations. Chapter 5 62

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**Business Executives and the Choice of Risk**

Example The executives made substantial efforts to reduce or eliminate risk by delaying decisions and collecting more information. Chapter 5 62

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**Reducing Risk Three ways consumers attempt to reduce risk are:**

1) Diversification 2) Insurance 3) Obtaining more information Chapter 5 67

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**Reducing Risk Diversification**

Suppose a firm has a choice of selling air conditioners, heaters, or both. The probability of it being hot or cold is 0.5. The firm would probably be better off by diversification. Chapter 5 68

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**Income from Sales of Appliances**

Hot Weather Cold Weather Air conditioner sales $30,000 $12,000 Heater sales 12,000 30,000 * 0.5 probability of hot or cold weather Chapter 5 69

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Reducing Risk Diversification If the firms sells only heaters or air conditioners their income will be either $12,000 or $30,000. Their expected income would be: 1/2($12,000) + 1/2($30,000) = $21,000 Chapter 5 70

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Reducing Risk Diversification If the firm divides their time evenly between appliances their air conditioning and heating sales would be half their original values. Chapter 5 71

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Reducing Risk Diversification If it were hot, their expected income would be $15,000 from air conditioners and $6,000 from heaters, or $21,000. If it were cold, their expected income would be $6,000 from air conditioners and $15,000 from heaters, or $21,000. Chapter 5 72

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Reducing Risk Diversification With diversification, expected income is $21,000 with no risk. Chapter 5 72

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Reducing Risk Diversification Firms can reduce risk by diversifying among a variety of activities that are not closely related. Chapter 5 73

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**Reducing Risk Discussion Questions The Stock Market**

How can diversification reduce the risk of investing in the stock market? Can diversification eliminate the risk of investing in the stock market? Chapter 5 73

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**Reducing Risk Risk averse are willing to pay to avoid risk.**

Insurance Risk averse are willing to pay to avoid risk. If the cost of insurance equals the expected loss, risk averse people will buy enough insurance to recover fully from a potential financial loss. Chapter 5 74

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**The Decision to Insure No $40,000 $50,000 $49,000 $9,055**

Insurance Burglary No Burglary Expected Standard (Pr = .1) (Pr = .9) Wealth Deviation No $40,000 $50,000 $49,000 $9,055 Yes 49,000 49,000 49,000 0 Chapter 5 75

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Reducing Risk Insurance While the expected wealth is the same, the expected utility with insurance is greater because the marginal utility in the event of the loss is greater than if no loss occurs. Purchases of insurance transfers wealth and increases expected utility. Chapter 5 76

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**The Law of Large Numbers**

Reducing Risk The Law of Large Numbers Although single events are random and largely unpredictable, the average outcome of many similar events can be predicted. Chapter 5 77

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**The Law of Large Numbers**

Reducing Risk The Law of Large Numbers Examples A single coin toss vs. large number of coins Whom will have a car wreck vs. the number of wrecks for a large group of drivers Chapter 5 77

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**Reducing Risk Assume: Actuarial Fairness**

10% chance of a $10,000 loss from a home burglary Expected loss = .10 x $10,000 = $1,000 with a high risk (10% chance of a $10,000 loss) 100 people face the same risk Chapter 5 77

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**Reducing Risk Then: Actuarial Fairness**

$1,000 premium generates a $100,000 fund to cover losses Actual Fairness When the insurance premium = expected payout Chapter 5 77

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**The Value of Title Insurance When Buying a House**

Example A Scenario: Price of a house is $200,000 5% chance that the seller does not own the house Chapter 5 77

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**The Value of Title Insurance When Buying a House**

Example Risk neutral buyer would pay: Chapter 5 77

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**The Value of Title Insurance When Buying a House**

Example Risk averse buyer would pay much less By reducing risk, title insurance increases the value of the house by an amount far greater than the premium. Chapter 5 77

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**The Value of Information**

Reducing Risk The Value of Information Value of Complete Information The difference between the expected value of a choice with complete information and the expected value when information is incomplete. Chapter 5 79

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**The Value of Information**

Reducing Risk The Value of Information Suppose a store manager must determine how many fall suits to order: 100 suits cost $180/suit 50 suits cost $200/suit The price of the suits is $300 Chapter 5 80

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**The Value of Information**

Reducing Risk The Value of Information Suppose a store manager must determine how many fall suits to order: Unsold suits can be returned for half cost. The probability of selling each quantity is .50. Chapter 5 80

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**The Decision to Insure Sale of 50 Sale of 100 Profit**

Expected Sale of 50 Sale of 100 Profit 1. Buy 50 suits $5,000 $5,000 $5,000 2. Buy 100 suits 1,500 12,000 6,750 Chapter 5 81

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**Reducing Risk With incomplete information: Risk Neutral: Buy 100 suits**

Risk Averse: Buy 50 suits Chapter 5 82

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**The Value of Information**

Reducing Risk The Value of Information The expected value with complete information is $8,500. 8,500 = .5(5,000) + .5(12,000) The expected value with uncertainty (buy 100 suits) is $6,750. Chapter 5 82

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**The Value of Information**

Reducing Risk The Value of Information The value of complete information is $1,750, or the difference between the two (the amount the store owner would be willing to pay for a marketing study). Chapter 5 82

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**The Value of Information: Example**

Reducing Risk The Value of Information: Example Per capita milk consumption has fallen over the years The milk producers engaged in market research to develop new sales strategies to encourage the consumption of milk. Chapter 5 83

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**The Value of Information: Example**

Reducing Risk The Value of Information: Example Findings Milk demand is seasonal with the greatest demand in the spring Ep is negative and small EI is positive and large Chapter 5 84

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**The Value of Information: Example**

Reducing Risk The Value of Information: Example Milk advertising increases sales most in the spring. Allocating advertising based on this information in New York increased sales by $4,046,557 and profits by 9%. The cost of the information was relatively low, while the value was substantial. Chapter 5 85

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**The Demand for Risky Assets**

Something that provides a flow of money or services to its owner. The flow of money or services can be explicit (dividends) or implicit (capital gain). Chapter 5 86

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**The Demand for Risky Assets**

Capital Gain An increase in the value of an asset, while a decrease is a capital loss. Chapter 5 86

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**The Demand for Risky Assets**

Risky & Riskless Assets Risky Asset Provides an uncertain flow of money or services to its owner. Examples apartment rent, capital gains, corporate bonds, stock prices Chapter 5 88

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**The Demand for Risky Assets**

Risky & Riskless Assets Riskless Asset Provides a flow of money or services that is known with certainty. Examples short-term government bonds, short-term certificates of deposit Chapter 5 88

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**The Demand for Risky Assets**

Asset Returns Return on an Asset The total monetary flow of an asset as a fraction of its price. Real Return of an Asset The simple (or nominal) return less the rate of inflation. Chapter 5 89

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**The Demand for Risky Assets**

Asset Returns Chapter 5 90

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**The Demand for Risky Assets**

Expected vs. Actual Returns Expected Return Return that an asset should earn on average Chapter 5 90

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**The Demand for Risky Assets**

Expected vs. Actual Returns Actual Return Return that an asset earns Chapter 5 90

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**Investments--Risk and Return (1926-1999)**

Real Rate of (standard Return (%) deviation,%) Common stocks (S&P 500) Long-term corporate bonds U.S. Treasury bills Chapter 5 92

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**The Demand for Risky Assets**

Expected vs. Actual Returns Higher returns are associated with greater risk. The risk-averse investor must balance risk relative to return Chapter 5 93

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**The Demand for Risky Assets**

The Trade-Off Between Risk and Return An investor is choosing between T-Bills and stocks: T-bills (riskless) versus Stocks (risky) Rf = the return on risk free T-bills Expected return equals actual return when there is no risk Chapter 5 94

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**The Demand for Risky Assets**

The Trade-Off Between Risk and Return An investor is choosing between T-Bills and stocks: Rm = the expected return on stocks rm = the actual returns on stock Chapter 5 94

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**The Demand for Risky Assets**

The Trade-Off Between Risk and Return At the time of the investment decision, we know the set of possible outcomes and the likelihood of each, but we do not know what particular outcome will occur. Chapter 5 95

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**The Demand for Risky Assets**

The Trade-Off Between Risk and Return The risky asset will have a higher expected return than the risk free asset (Rm > Rf). Otherwise, risk-averse investors would buy only T-bills. Chapter 5 96

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**The Demand for Risky Assets**

The Investment Portfolio How to allocate savings: b = fraction of savings in the stock market 1 - b = fraction in T-bills Chapter 5 97

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**The Demand for Risky Assets**

The Investment Portfolio Expected Return: Rp: weighted average of the expected return on the two assets Rp = bRm + (1-b)Rf Chapter 5 98

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**The Demand for Risky Assets**

The Investment Portfolio Expected Return: If Rm = 12%, Rf = 4%, and b = 1/2 Rp = 1/2(.12) + 1/2(.04) = 8% Chapter 5 98

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**The Demand for Risky Assets**

The Investment Portfolio Question How risky is their portfolio? Chapter 5 98

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**The Demand for Risky Assets**

The Investment Portfolio Risk (standard deviation) of the portfolio is the fraction of the portfolio invested in the risky asset times the standard deviation of that asset: Chapter 5 99

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**The Demand for Risky Assets**

The Investor’s Choice Problem Determining b: Chapter 5 100

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**The Demand for Risky Assets**

The Investor’s Choice Problem Determining b: Chapter 5 101

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**The Demand for Risky Assets**

Risk and the Budget Line Observations 1) The final equation is a budget line describing the trade- off between risk and expected return Chapter 5 102

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**The Demand for Risky Assets**

Risk and the Budget Line Observations: 2) Is an equation for a straight line: 3) Chapter 5 103

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**The Demand for Risky Assets**

Risk and the Budget Line Observations 3) Expected return, RP, increases as risk increases. 4) The slope is the price of risk or the risk-return trade-off. Chapter 5 104

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**Choosing Between Risk and Return**

U2 is the optimal choice of those obtainable, since it gives the highest return for a given risk and is tangent to the budget line. Expected Return,Rp Rf Budget Line Rm R* U2 U1 U3 Chapter 5 109

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**The Choices of Two Different Investors**

Expected Return,Rp Given the same budget line, investor A chooses low return-low risk, while investor B chooses high return- high risk. UA RA UB RB Rm Budget line Rf Chapter 5 113

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**Buying Stocks on Margin**

UA RA UA: High risk aversion --Stock & T-bill portfolio Expected Return,Rp UB RB Rm UA: Low risk aversion --The investor would invest more than 100% of their wealth by borrowing or buying on the margin. Rf Budget line Chapter 5 113

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**Investing in the Stock Market**

Observations Percent of American families who had directly or indirectly invested in the stock market 1989 = 32% 1995 = 41% Chapter 5

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**Investing in the Stock Market**

Observations Share of wealth in the stock market 1989 = 26% 1995 = 40% Chapter 5

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**Investing in the Stock Market**

Observations Participation in the stock market by age Less than 35 1989 = 23% 1995 = 29% More than 35 Small increase Chapter 5

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**Investing in the Stock Market**

What Do You Think? Why are more people investing in the stock market? Chapter 5

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Summary Consumers and managers frequently make decisions in which there is uncertainty about the future. Consumers and investors are concerned about the expected value and the variability of uncertain outcomes. Chapter 5 114

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Summary Facing uncertain choices, consumers maximize their expected utility, and average of the utility associated with each outcome, with the associated probabilities serving as weights. A person may be risk averse, risk neutral or risk loving. Chapter 5 115

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Summary The maximum amount of money that a risk-averse person would pay to avoid risk is the risk premium. Risk can be reduced by diversification, purchasing insurance, and obtaining additional information. Chapter 5 116

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Summary The law of large numbers enables insurance companies to provide actuarially fair insurance for which the premium paid equals the expected value of the loss being insured against. Consumer theory can be applied to decisions to invest in risky assets. Chapter 5 117

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**Choice Under Uncertainty**

End of Chapter 5 Choice Under Uncertainty 1

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