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20? Video Disk
Case I
Home Video
Laser Disk
DVD
Beta
VHS
Video Disk
Case II
Home Video
Video Disk
Laser Disk
DVD
Beta
VHS
21????????
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22???????
???I ?????
A (40)
B (20)
C (20)
D (20)
???II ???? (2???????)
A (40)
B (20)
C (20)
D (20)
- A????????????A???????????????
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??????????????????????????.
A (40)
B (20)
C (20)
D (20)
A?????????B????? 13.3 4020/(202020)?????????
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24??????
- 2???????
- Firm-oriented
- Customer-oriented
- Urban, Johnson and Hauser(1984), Testing
Competitive Market Structure, Marketing Science,
Vol. 3, No. 2, 83-112
25Customer-Oriented ??????(Prodegy)
26???????????
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27???????????????
?? A B P(A,B) C D P(C,D)
A 40 0 1/3 1/3 1/2 1/6 2/3
B 20 1/2 0 1/2 3/8 1/8 1/2
C 30 4/7 2/7 6/7 0 1/7 1/7
D 10 4/9 2/9 2/3 1/3 0 1/3
28???????(??????)
?? A B P(A,B) C D P(C,D)
A 40 0 30 0.75 6 4 0.25
B 20 12 0 0.6 4 4 0.4
C 30 5 7 0.4 0 18 0.6
D 10 1 1 0.2 8 0 0.8
29???????(??????)
?? A B P(A,B) C D P(C,D)
A 40 0 3/4 0.75 3/20 1/10 0.25
B 20 3/5 0 0.6 1/5 1/5 0.4
C 30 1/6 7/30 0.4 0 3/5 0.6
D 10 1/10 1/10 0.2 4/5 0 0.8
30??????????
?? A B P(A,B) C D P(C,D)
A 40 0 1/3 1/3 1/2 1/6 2/3
B 20 1/2 0 1/2 3/8 1/8 1/2
C 30 4/7 2/7 6/7 0 1/7 1/7
D 10 4/9 2/9 2/3 1/3 0 1/3
???
?? A B P(A,B) C D P(C,D)
A 40 0 3/4 0.75 3/20 1/10 0.25
B 20 3/5 0 0.6 1/5 1/5 0.4
C 30 1/6 7/30 0.4 0 3/5 0.6
D 10 1/10 1/10 0.2 4/5 0 0.8
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31??A??????
- ??A?????????????????(A,B)?????
- P(A,B)1/3p
- ??A?????????????????(C,D)?????????
- P(C,D)2/31-p
- ??????A??????????????????(A,B)????????p???np(1-p)?
???????? - X Bin(n,p)
32??A??????
- ??????????n????????????
- X N(np,np(1-p))
- ??B,C?D????????????????????
- ??
- ???? H0 np 40/3
- ???? H1 np gt 40/3
33???????
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- ???? H0 np (40/320/230/710/3)31
- ???? H1 np gt 31
- ???4.45
- ???301218868
34??
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- ????2007?10?16?
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39??1
40??2
41???????????????
???? ???? ??????
1996?1? 4,406 4,406
1996?2? 6,952 11,358
1996?3? 12,090 23,448
1996?4? 8,213 31,661
1996?5? 8,201 39,862
1996?6? 7,640 47,502
1996?7? 7,174 54,676
1996?8? 4,015 58,691
1996?9? 6,296 64,987
1996?10? 5,295 70,282
1996?11? 4,989 75,271
1996?12? 4,289 79,560
42????
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????? 91023 0.114 0.118
???? ?? (a) (b) 100 - (b)
0 0.00 0.00 100.00
1996?1? 1 7.61 7.61 92.39
1996?2? 2 8.05 15.66 84.34
1996?3? 3 8.58 24.24 75.76
1996?4? 4 9.02 33.26 66.74
1996?5? 5 8.96 42.22 57.78
1996?6? 6 8.62 50.84 49.16
1996?7? 7 8.04 58.88 41.12
1996?8? 8 7.28 66.16 33.84
1996?9? 9 6.75 72.91 27.09
1996?10? 10 5.79 78.70 21.30
1996?11? 11 4.85 83.55 16.45
1996?12? 12 3.86 87.41 12.59
13 2.92 90.33 9.67
26 0.08 99.87 0.13
43?????????
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44??
- ????????????TV???????
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- ????2007?10?23?