What does, according to the author, economic welfare consist of
A.a general sense of contentment with any individual being part of a group. B.a basic duality or dichotomy between the amount of pleasures that one individual can experience and discontentment. C.the act of measuring the amount of gratifications and dissatisfactions with a measure of value. D.the relentless idea that people have to forfeit in expiation for their pleasures.