. My key insight is that social welfare functions that only rely on each individual’s utility still may reflect what people … put an equal sign between welfarist methods and social welfare functions that only rely on each individual’s utility. I … usefully illustrate how easily one can construct a simple counter example using familiar non-welfarist ideas and utility …

-ers’ utility functions, if they exist at all, might not even belong to the class of quasi-concave functions. However, the main task …, quasi-concave utility functions are unnecessary for the determination of equilibrium price vectors. …