Satterthwaite theorem prove that any useful single-winner voting method based on preference ranking is prone to some kind of manipulation, some use game theory to search for some kind of "minimally manipulatable" (incentive compatibility) voting schemes.
Any useful single-winner voting method based on preference ranking is prone to some kind of manipulation to search for some kind of "minimally manipulatable" (incentive compatibility) voting schemes. Satterthwaite theorem prove this. Manipulation is some use game theory.