Why does Mexico’s mixed legislative system diverge from Duverger’s Law? Rather than rehash cultural and historical explanations, we suggest two institutional factors – a fused ballot and compulsory voting laws – may explain this divergence. Cross-national evidence controlling for these factors suggests Mexico is not an outlier and that the fused ballot encourages multiparty district competition. The results also suggest ways reforms could bring competition closer toward Duvergerian expectations.
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Banerjee et al. (2016) studied this question.
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