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172 Chapter 5 Competitors and Competition

TABLE 5.1

Concentration Statistics for Selected U.S. Industries, 2007

 

 

Number

4-firm

20-firm

Code

Industry

of Firms

CR

CR

44311

Appliance, television, and other electronics stores

38387

56

67

44312

Computer and software stores

10428

73

79

44711

Gasoline stations with convenience stores

97508

11

32

45311

Florists

19822

2

5

48111

Scheduled passenger air transportation

3129

50

90

48412

General freight trucking, long distance

38769

16

36

49311

General warehousing and storage

10184

25

38

49312

Refrigerated warehousing and storage

1114

39

64

51211

Motion picture and video production

12192

53

75

51213

Motion picture and video exhibition

5133

54

73

51511

Radio broadcasting

7263

38

65

51512

Television broadcasting

2208

43

72

51521

Cable and other subscription programming

717

62

94

52211

Commercial banking

91116

32

56

52393

Investment advice

16708

27

44

61141

Business and secretarial schools

377

20

48

72111

Hotels (except casino hotels) and motels

48108

23

35

72112

Casino hotels

307

41

69

72121

RV parks and recreational camps

7420

7

13

72211

Full service restaurants

220089

9

17

 

 

 

 

 

Source: 2007 Economic Census, Various Industry Series Reports; Washington, DC: U.S. Census Bureau.

The Herfindahl conveys more information than the N-firm concentration ratio. If one believes that the relative size of the largest firms is an important determinant of conduct and performance, as economic theory suggests, then the Herfindahl is likely to be more informative.

MARKET STRUCTURE AND COMPETITION

The structure of a market can profoundly affect the conduct and financial performance of its firms; the causal connection is known as the Structure, Conduct, Performance paradigm. Market structure can range from perfect competition at one extreme to monopoly at the other. In between these extremes are at least two other broad categories of market structure: monopolistic competition and oligopoly. Table 5.2 lists these categories and gives a range of associated Herfindahls. These ranges are only suggestive, because there are many factors besides market structure that contribute to conduct and performance. For example, some markets with two firms and a Herfindahl of .5 or higher could experience fierce competition with prices near marginal costs. On the other hand, price competition can be all but nonexistent in some markets that have five competitors or more with Herfindahls below .2. Thus it is essential to assess all the circumstances affecting competition rather than rely solely on measures of market structure.

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