“Matthew Shugart”:http://fruitsandvotes.com/?p=5143:
The best argument that the pro-AV camp in this referendum seems to have come up with is that your MP will “work harder” and will have to earn a majority of the district’s voters. I assume MPs tend to work pretty hard as it is, and to the extent that many of them already are pretty close to the median voter in their district (even when winning 40% or less), it is not clear that they have to work any harder under AV. Moreover, given that the proposed version of AV for the UK would allow voters to give only one or as few preferences as they wish, it is simply not true that the system will guarantee endorsement of every MP by a majority of voters.