C.G.Clark

potential leading industry

12354

1-234

1-

2

3=512.5110.5

41960

7

123

1

2

3

1J.R.Friedman19661243

1234 10% 10%25% 25%50%

2

1 3 2

3 1988

1234

1 2 3 :

12123

1 2 3 4

:

12313267

1012345678910)

Bird

12 1 break-in-transport Physical break Commercial break Political break 23123

S3

197510%30%70%

18

0.9685821140603801520400-60010020200030% 17