CES has a whole page on this. In a nutshell, the reason this works is because the people who approve only X or Y have a pretty similar X versus Y opinion as th

CES has a whole page on this. In a nutshell, the reason this works is because the people who approve only X or Y have a pretty similar X versus Y opinion as the whole electorate, just based on random chance. It's just statistical sampling principles. https://www.electionscience.org/library/expressiveness-in-approval-vs-ranked-ballots/ https://www.electionscience.org/library/expressiveness-in-ap...