An objective of this paper is to analyze in detail the structure of a
money-metric function, i.e. a p-section of the Mckenzie expenditure fu
nction. We view this function from a new perspective and show that it
is similar in structure to the metric utility functions of Wold and Ar
row-Hahn. A generalization of the Arrow-Hahn theorem on utility functi
ons is also obtained.