センのリベラルパラドックス
社会的選好関係に循環が生じて決定不能になる
no social system can simultaneously
be committed to a minimal sense of freedom,
always result in a type of economic efficiency known as Pareto efficiency, and
be capable of functioning in any society whatsoever
https://en.wikipedia.org/wiki/Liberal_paradox
http://www.f.waseda.jp/ksuga/pubphil1212.pdf
パレート原理