http://www.newscientist.com/article/mg20627581.400-electoral-dysfunction-why-democracy-is-always-unfair.html
The article is wrong on a point.
There is one (and it can be mathematically proved that it is the ONLY one) voting system which satisfies all four of Arrow requirements: it is dictatorship (only one voter).
Food for thought, isn't it?
Bye!!! (and hail Emperor Palpatine ;D )
;D