[rbkillea]

I'm pretty sure that Quadratic Voting is a way to assign prices to votes, whereas this theorem is about the features of a system in which the results are determined by vote. So the results of quadratic voting will meet this criteria because after the votes are bought they can be thought of as emanating from discrete voters who align their preferences with those of the buyer.

That is to say that the issues solved by Quadratic Voting and those presented in Arrow's theorem are orthogonal.