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Portfolio Analysis

 

August 11, 2004

 

 

Holdings

 

 

Aug-04

1

F

2

NBG

3

YHOO

4

NKE

5

BA

6

VRSN

7

JDSU

8

CAT

9

JNJ

10

NSM

11

CA

12

FNF

13

MWD

14

TKC

15

HMC

16

CRYP

17

X

18

AAPL

19

COP

20

ACH

 

 

Performance of Individual Stocks For last 3 months:

 

Aug-04

 

FNF

8.19%

COP

1.23%

CAT

-0.92%

NKE

4.41%

BA

16.07%

VRSN

-5.74%

JDSU

-2.22%

YHOO

2.47%

JNJ

2.09%

NSM

-36.96%

CA

-11.80%

F

-0.38%

MWD

-8.29%

TKC

32.45%

HMC

18.55%

CRYP

-26.88%

X

35.94%

AAPL

14.30%

NBG

-3.26%

WB

-0.50%

 

 

 

Total Increase (Decrease) since last quarter: 1.94%

Additions:  ACH

Subtractions: WB

Commentary:  My commentary this quarter is on the marginal investor, and his or her power in the market.  At any given time, it is the people who are trading who impact asset prices, not passive shareholders.  In this way the market is analogous to voting.  Though only a small percentage of people vote in the USA (sadly), their actions influence the government for everyone.  Similarly, though just a fraction of shareholders in a given security trade it in a given day, the price they agree upon impacts the share prices of everyone who holds the security.

 

On this minute level, do things work efficiently?  Theory seems to say yes.  But the following example I am about to present seems to imply that the actual price of a stock will be slightly higher than its intrinsic value. 

Let’s take a hypothetical example.  Suppose the ‘intrinsic value’ of AAPL is $29.5 per share, and there are 1,000 shares of AAPL in the universe.  Let’s also assume that there are a large number (1,000) of investors in this model, and that such investors subscribe to a range of valuation estimates that are normally distributed around $29.50 with a standard deviation of around $1.00.  Furthermore, each estimate receives equal weight in the market[1].  In other words, there are 1,000 analysts covering this stock and they each have an equal number of ears and dollars that listen to them.  Where will the stock trade?  It will trade at about $29.675, not  at $29.50

 

Here is why:  In most real life stock market decisions, the propensity to buy is proportional to the difference between the market price and the estimate of intrinsic value, whereas the propensity to sell is merely dependent upon the asset price being mores than the estimate of intrinsic value.  I suppose that there are several ways to model the demand function.  I have chosen a simple model whereby the demand for a stock is proportional to the percent at which a buyer feels it is overvalued:

 

                                                                        Stock demand = [(estimated intrinsic value/market value)-1]*100[2]

                       

Suppose the stock is at 29.5.  Then, if we assume rational shareholders, all current shareholders will subscribe to the 50% of the most optimistic analysts in the coverage world.  In other words, in figure 1, only analysts in yellow are listened to by people who actually own AAPL.  They probably bought their shares from people listening to the purple analysts.[3] 

 

However, within the population of shareholders, things are not at equilibrium at 29.5.  This is because people who believe the stock is very close to its intrinsic value are not likely to hold copious quantities of it, while those who believe the stock is significantly undervalued will hold more of it.  The following shows the intrinsic value estimates for people that actually would consider holding AAPL at 29.5:   

 

 

But, the equilibrium state would not be having each of these 500 people holding 2 shares each.  People with higher expectations of the value of the stock will hold more than those who feel the stock is priced about correctly.  The following three tables estimate how demand-weighting brings the equilibrium price to 29.675:

 

 

Price=29.5

 

 

 

Intrinsic Value Estimate

Number of Subscribers

Shares/Person demanded at given price

Weighted Demand

29.5

39.8

0

0

29.6

39.5

0.338983051

13.38983051

29.7

38.6

0.677966102

26.16949153

29.8

37.5

1.016949153

38.13559322

29.9

36.1

1.355932203

48.94915254

30

34.2

1.694915254

57.96610169

30.1

32.3

2.033898305

65.69491525

30.2

30.1

2.372881356

71.42372881

30.3

27.8

2.711864407

75.38983051

30.4

25.4

3.050847458

77.49152542

30.5

23

3.389830508

77.96610169

30.6

20.6

3.728813559

76.81355932

30.7

18.3

4.06779661

74.44067797

30.8

16

4.406779661

70.50847458

30.9

14

4.745762712

66.44067797

31

12

5.084745763

61.01694915

31.1

10.2

5.423728814

55.3220339

31.2

8.7

5.762711864

50.13559322

31.3

7.2

6.101694915

43.93220339

31.4

5.9

6.440677966

38

31.5

4.9

6.779661017

33.22033898

31.6

4

7.118644068

28.47457627

31.7

3.2

7.457627119

23.86440678

31.8

2.5

7.796610169

19.49152542

31.9

2

8.13559322

16.27118644

32

1.5

8.474576271

12.71186441

32.1

1.2

8.813559322

10.57627119

32.2

0.9

9.152542373

8.237288136

32.3

0.7

9.491525424

6.644067797

32.4

0.6

9.830508475

5.898305085

32.5

1.3

10.16949153

13.22033898

 

 

 

 

 

 

Total Shares Demanded

1267.79661

There are 1,267 shares demanded at a price of 29.5, too many.  So let’s try 29.6

Price=29.6

 

 

 

Intrinsic Value Estimate

Number of Subscribers

Shares/Person demanded at given price

Weighted Demand

29.5

39.8

0

0

29.6

39.5

0

0

29.7

38.6

0.337837838

13.04054054

29.8

37.5

0.675675676

25.33783784

29.9

36.1

1.013513514

36.58783784

30

34.2

1.351351351

46.21621622

30.1

32.3

1.689189189

54.56081081

30.2

30.1

2.027027027

61.01351351

30.3

27.8

2.364864865

65.74324324

30.4

25.4

2.702702703

68.64864865

30.5

23

3.040540541

69.93243243

30.6

20.6

3.378378378

69.59459459

30.7

18.3

3.716216216

68.00675676

30.8

16

4.054054054

64.86486486

30.9

14

4.391891892

61.48648649

31

12

4.72972973

56.75675676

31.1

10.2

5.067567568

51.68918919

31.2

8.7

5.405405405

47.02702703

31.3

7.2

5.743243243

41.35135135

31.4

5.9

6.081081081

35.87837838

31.5

4.9

6.418918919

31.4527027

31.6

4

6.756756757

27.02702703

31.7

3.2

7.094594595

22.7027027

31.8

2.5

7.432432432

18.58108108

31.9

2

7.77027027

15.54054054

32

1.5

8.108108108

12.16216216

32.1

1.2

8.445945946

10.13513514

32.2

0.9

8.783783784

7.905405405

32.3

0.7

9.121621622

6.385135135

32.4

0.6

9.459459459

5.675675676

32.5

1.3

9.797297297

12.73648649

 

 

 

 

 

 

Total Shares Demanded

1108.040541

Still too many shares demanded.  Let’s try 29.675:

Price=29.675

 

 

 

Intrinsic Value Estimate

Number of Subscribers

Shares/Person demanded at given price

Weighted Demand

29.5

39.8

0

0

29.6

39.5

0

0

29.7

38.6

0.084245998

3.251895535

29.8

37.5

0.421229992

15.79612468

29.9

36.1

0.758213985

27.37152485

30

34.2

1.095197978

37.45577085

30.1

32.3

1.432181971

46.25947767

30.2

30.1

1.769165965

53.25189553

30.3

27.8

2.106149958

58.55096883

30.4

25.4

2.443133951

62.05560236

30.5

23

2.780117944

63.94271272

30.6

20.6

3.117101938

64.21229992

30.7

18.3

3.454085931

63.20977254

30.8

16

3.791069924

60.65711879

30.9

14

4.128053917

57.79275484

31

12

4.465037911

53.58045493

31.1

10.2

4.802021904

48.98062342

31.2

8.7

5.139005897

44.70935131

31.3

7.2

5.47598989

39.42712721

31.4

5.9

5.812973884

34.29654591

31.5

4.9

6.149957877

30.1347936

31.6

4

6.48694187

25.94776748

31.7

3.2

6.823925864

21.83656276

31.8

2.5

7.160909857

17.90227464

31.9

2

7.49789385

14.9957877

32

1.5

7.834877843

11.75231676

32.1

1.2

8.171861837

9.806234204

32.2

0.9

8.50884583

7.657961247

32.3

0.7

8.845829823

6.192080876

32.4

0.6

9.182813816

5.50968829

32.5

1.3

9.51979781

12.37573715

 

 

 

 

 

 

Total Shares Demanded

998.9132266

Close enough.

 

So, this model shows that using the chosen weighting system, the price of a stock with a range of analyst estimates will trade at a higher value than its intrinsic value.  In this case, it is 17.5% of one standard deviation.  I’m not going to go into deep mathematics to come up with a formula for estimating the premium above intrinsic value where a stock will trade, since it really depends on the weighting on the demand function, and I have no idea what an appropriate weighting might be.  Nonetheless, there is some skew here, and it is perhaps important to keep this in mind (perhaps it is not important).

 

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[1] In other words, there are no ‘star analysts’ that carry a disproportionate weight in the market.

[2] This assumes only positive demands are possible.  In the real world, negative demand could translate into an buyer shorting a stock.  This is not considered.

[3] The color choice of yellow and purple in no way implies that I am secret a Lakers fan.  This was a random accident that I am too lazy to change.  Go Kings!