Abstract
The objective of this article is to develop and apply several types of price indexes to the analysis of pharmaceutical expenditure to improve the way traditional indexes adjust for innovation in drug supply. The Laspeyres and Paasche indexes in the fixed and linked modalities were used. Price is defined as average expenditure at consumer price per daily defined dose (DDD). The empirical application is restricted to two therapeutic groups, antipsychotics and antidepressants, and to the pharmaceutical expenditure of the Catalan Health Service in the period 1991–1999. The indexes can be computed from the information currently recorded in the administrative procedures of health care insurers, or from sample information provided by regular market surveys. The proposed method allows for controlling the effect of several factors on average pharmaceutical price changes, specifically, the introduction of new drugs that show some degree of therapeutic innovation.
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