It was September 1954, fifty years ago this month, that the Americna
Political Science Review published its first article that used
significant mathematics, apart from articles using statistics.

It was "A Method for Evaluating the Distribution of Power in a
Committee System" by Lloyd Shapley and Martin Shubik.  It defined a
measure of the theoretical power that a committee member has by virtue
of the voting rules and nothing else, e.g., not the person's connections
or charisma, etc.  For example, considering the US legislative process
as one big committee, the powers of a president, senator and member of
the house were calculated as having the ratio of 350:9:2.

Shapley and Shubik were graduate students at Princeton.  The latter
told me that he and Shapley sent the paper in on the advice of a
professor in the political science department, never thinking it would
be accepted, but after three weeks the news came that it was in.  He
thinks the referee who blessed it must have been a Very Important
Person.  Years later he asked Herbert Simon if it was him, but it
wasn't.

The method has generated hundreds of articles, most of which use it
prescriptively -- as a guide to how to set up fair rules when some
members should have more power than others.  It could set voting weights
in a body like the European Council of Ministers where some of the
countries have more population.  The approach is a counterexample to the
idea that mathematical methods make political science non-normative.

Martin Shubik was Nash's roommate at Princeton -- in the movie A
Beautiful Mind, the roommate is named Martin, but he turns out to be
imaginary -- this is not so!  A modification to the method that has been
used in metropolitan councils is the Banzhaf Index, invented by John
Banzhaf, a lawyer who now crusades against fast food, and who appeared
in the movie Supersize Me.



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