| 研究概要 |
I elaborate Suppes' (1977, Erkenntnis Vol. 11, No.1, pp 233-250) derivation of the logarithmic function as a consumer's cardinal utility function on money income levels, in which the consumer's preferences are specified by a level comparison relation and a difference comparison relation. Without assuming Suppes' hypothesis (Bernoulli's hy-pothesis or Weber-Fechner law), which asserts that the utility values are proportional to the logarithmic values of in-come levels, it is shown that the representability of the two relations by logarithmic utility function can be characterized only by the three (mutually independent) axioms on the relations.
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