hardhat no this is not about PR.
Lots of people would like to see a system of PR - proportional representation - which means the same proportion of MPs in the commons as the proportion of votes cast. But this referendum is not about PR. The downside of PR is that you can't have PR and small constituencies with a single MP in - so it breaks the link between MPs and their constituents.
PR would pretty much guarantee coalition governments. AV only makes them a little more likely.
Given that this is NOT about PR - what is the fairest way to elect a single winner from multiple parties? If there are only two parties it is easy - it is always going to be clear which wins. With three or more there are two options. The current system is inaccurately called first past the post. More accurately called plurality voting. The one with the most votes wins. If you have five candidates with nearly equal support, you can win with 21% of the vote.
The AV system is rather like the X Factor. You express a preference, numbering candidates 1 - 5. If you want you can stop at 4, or just vote for a single candidate. The votes are counted and the candidate with the lowest number is eliminated - just like the X Factor. Rather than having another expensive election with the remaining candidates, the votes from the loser are spread around the other four according to their next preference. And so on until someone has 50% of the vote.
This prevents tactical voting (although Giddypickle will deny this but just google it if you want to know who to believe).
It means you can vote for your favourite party even if you think they won't win. This actually may give that party a chance that it never had before.
In every case AV will give either the same result as FPTP or a fairer one.
- if more than 50% vote 1 for party A, party A gets in with both systems.
- if less than 50% vote 1 for party A, but when the smallest parties are redistributed party A gets over the 50%, party A gets in with both systems.
- if party A get say 40%, party B 35% and party C 25%, party A would win under FPTP. But if the party C second preferences go 20/25 to B and 5/25 to A then B overtakes A in the second round and wins under AV. This is fairer - in this case clearly B and C are similar parties and are splitting the vote (whether this is a leftish vote or a rightish one). Note that in a head to head election, B would beat A, B would beat C, so it is clear that B winning is the fairest result.
A1980 there is no difference between AV and FPTP when there are only two options
petitepeach see above - FPTP allows a party to get in without a majority - it is only under AV that a majority of voters is needed.
balia if we say no to this there will be no electoral reform for decades - the interpretation will be that the people want the status quo. AV can be modified to AV+ which is a proportional system - so if you want PR vote YES and then press for more change.
Glad to see so much support for AV here. Lets hope the polls are wrong and we get some political change in this country.
By the way - no other country in Europe has FPTP...