Are Weighted Games Sufficiently Good for Binary Voting?

Titelangaben

Kurz, Sascha:
Are Weighted Games Sufficiently Good for Binary Voting?
In: Homo Oeconomicus. Bd. 38 (2021) . - S. 29-36.
ISSN 2366-6161
DOI: https://doi.org/10.1007/s41412-021-00111-6

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Abstract

Binary yes-no decisions in a legislative committee or a shareholder meeting are commonly modeled as a weighted game. However, there are noteworthy exceptions. E.g., the voting rules of the European Council according to the Treaty of Lisbon use a more complicated construction. Here we want to study the question if we loose much from a practical point of view, if we restrict ourselves to weighted games. To this end, we invoke power indices that measure the influence of a member in binary decision committees. More precisely, we compare the achievable power distributions of weighted games with those from a reasonable superset of weighted games. It turns out that the deviation is relatively small.