Question

In: Advanced Math

A simplified version of the 2018 Canadian senate was [53:43,33,12,11,6]. compute the Shapley Shubik index of...

A simplified version of the 2018 Canadian senate was [53:43,33,12,11,6].
compute the Shapley Shubik index of the party with 43 votes.

Solutions

Expert Solution

Let us make a list of permutations of voters

there are 5!=120 coalations possible

43 33 12 11 6
33 43 12 11 6
33 43 11 12 6
43 33 11 12 6
43 33 6 12 11
33 43 6 12 11
33 43 12 6 11
43 33 12 6 11
33 43 6 11 12
43 33 6 11 12
43 33 11 6 12
33 43 11 6 12
12 43 33 11 6
43 12 33 11 6
43 12 11 33 6
12 43 11 33 6
43 12 33 6 11
12 43 33 6 11
12 43 6 33 11
43 12 6 33 11
43 12 6 11 33
12 43 6 11 33
12 43 11 6 33
43 12 11 6 33
11 43 12 33 6
43 11 12 33 6
43 11 33 12 6
11 43 33 12 6
43 11 6 33 12
11 43 6 33 12
11 43 33 6 12
43 11 33 6 12
11 43 6 12 33
43 11 6 12 33
43 11 12 6 33
11 43 12 6 33
33 12 43 11 6
12 33 43 11 6
12 33 43 6 11
33 12 43 6 11
11 33 43 12 6
33 11 43 12 6
33 11 43 6 12
11 33 43 6 12
6 43 33 12 11
43 6 33 12 11
43 6 33 11 12
6 43 33 11 12
33 6 43 12 11
6 33 43 12 11
6 33 43 11 12
33 6 43 11 12
12 11 43 33 6
11 12 43 33 6
11 12 43 6 33
12 11 43 6 33
43 6 12 33 11
6 43 12 33 11
6 43 12 11 33
43 6 12 11 33
6 12 43 33 11
12 6 43 33 11
12 6 43 11 33
6 12 43 11 33
6 43 11 33 12
43 6 11 33 12
43 6 11 12 33
6 43 11 12 33
11 6 43 33 12
6 11 43 33 12
6 11 43 12 33
11 6 43 12 33
12 33 11 43 6
33 12 11 43 6
33 12 11 6 43
12 33 11 6 43
33 11 12 43 6
11 33 12 43 6
11 33 12 6 43
33 11 12 6 43
11 12 33 43 6
12 11 33 43 6
12 11 33 6 43
11 12 33 6 43
33 12 6 43 11
12 33 6 43 11
6 33 12 43 11
33 6 12 43 11
12 6 33 43 11
6 12 33 43 11
11 33 6 43 12
33 11 6 43 12
33 6 11 43 12
6 33 11 43 12
6 11 33 43 12
11 6 33 43 12
12 11 6 43 33
11 12 6 43 33
6 12 11 43 33
12 6 11 43 33
11 6 12 43 33
6 11 12 43 33
12 33 6 11 43
33 12 6 11 43
33 6 12 11 43
6 33 12 11 43
6 12 33 11 43
12 6 33 11 43
33 11 6 12 43
11 33 6 12 43
6 33 11 12 43
33 6 11 12 43
11 6 33 12 43
6 11 33 12 43
11 12 6 33 43
12 11 6 33 43
12 6 11 33 43
6 12 11 33 43
6 11 12 33 43
11 6 12 33 43

the hilighted cells are pivot voters. party with 43 votes is pivot in 60 coalations out of 120.

so the shapley shubix index of party with 43 votes is = 60/120 = 1/2


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