Suzumura shows that a binary relation has a weak order extension if and only if it is consistent. However, consistency is demonstrably not sufficient to extend an upper semi-continuous binary relation to an upper semicontinuous weak order. Jaffray proves that any asymmetric (or reflexive),...

Social choice theory critically assesses and rationally designs economic mechanisms for improving human well-being. Kotaro Suzumura—one of the world’s foremost thinkers in social choice theory and welfare economics—fuses abstract ideas with real-world economies to examine foundational...