Abstract
The ‘best of both worlds’ thesis contends that mixed-member electoral systems should provide individual legislator accountability via single-member district (SMD) elections, as well as collective party accountability via a multi-member district (MMD) tier. This study evaluates the mandate divide and electoral connection under the Welsh mixed-member proportional system of representation during the 3rd (2007–11) and 4th (2011–16) Assemblies. Consistent with the best of both worlds thesis, electorally vulnerable SMD legislators are found to make more member bill attempts, and those whose member bills are randomly selected for introduction enjoy a significant boost in their electoral margin of victory. There is some evidence that MMD legislators are rewarded by their party selectorates for member bill efforts with a move up the party list, although this result is less robust. An additional check confirms the absence of contamination across electoral tiers.
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