자료 1: Edgeworth’s principle of arbitration (Sephorah Mangin, )
( ... ) Edgeworth defines ^means^, the distribution of which is to be determined, as "the distinguishable proximate means of pleasure, chiefly wealth as destined for consumption."
( ... ...)
Edgeworth' next step proves to be vital. He defines an individual's ^capacity for pleasure^ as follows: " an individual has a greater ^capacity for happiness^ than another, when for the same amount whatsoever of means he obtains a greater amount of pleasure, ^and also^ for the same increment (to the same amount) whatsoever of means a greater increment of pleasure."
자료 2: Edgeworth's Mathematical Psychics: A Centennial Notice (Warren J. Samuels, 1981)