Abstract
This note contains comments and supplements to Mezetti's article. Separable utility functions are studied to show that for two of Mezetti's results it is necessary to assume that utility functions are constructed from increasing functions. This assumption can be interpreted as a rationality of an individual. It is also shown that in the domain of separable utility functions the Gibbard paradox can be obtained, if functions are not increasing and it cannot be obtained if they are increasing.
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