derive these measures are largely unsatisfactory. The axiomatic theory of indexes does not make clear which economic problem …. For example, the theory of the CPI is usually developed for a single consumer with homothetic preferences and then applied … to a large aggregate of diverse consumers with non-homothetic preferences. In this paper I develop a unitary theory that …

The paper presents a general theory of the aggregation of prices and quantities that unifies the field and relates … topics that in the past have been treated separately and unsatisfactorily, or not at all. The theory does without the common … the theory lead to Törnqvist indexes defined on the appropriate data set. A numerical example confirms that in the non …