Not All Majority-based Social Choice Functions Are Obviously Strategy-proof

ALEJANDRO NEME; JORDI MASSO; R. PABLO ARRIBILLAGA

Workshop; Annual Meeting of the Latin American and Caribbean Economic Association and Latin American Meeting of the Econometric Society 2017; 2017

We consider two families of strategy-proof social choice functions basedon the majority principle: extended majority voting rules on the universal domainof preferences over two alternatives and generalized median voter schemes on thedomain of single-peaked preferences over a …nite and linearly ordered set of alternatives. We characterize their respective (and substantially smaller) subclasses of obviously strategy-proof social choice functions and for each one of them we identify an extensive game form that implements it in obviously dominant strategies.