Title: Voting power of political parties in the Senate of Chile during the whole binomial system period: 1990-2017,
Abstract: The binomial system is an electoral system unique in the world. It was used
to elect the senators and deputies of Chile during 27 years, from the return of
democracy in 1990 until 2017. In this paper we study the real voting power of
the different political parties in the Senate of Chile during the whole
binomial period. We not only consider the different legislative periods, but
also any party changes between one period and the next. The real voting power
is measured by considering power indices from cooperative game theory, which
are based on the capability of the political parties to form winning
coalitions. With this approach, we can do an analysis that goes beyond the
simple count of parliamentary seats.