“…6 Many of these measures have been developed to summarize grouped data on health outcomes and service utilization, and do not meet what may be considered basic criteria for inequality measures . However, the concentration index, which is directly related to the concentration curve, has been proposed as a superior measure, with the ability to capture the experiences of whole population, and to reflect changes in the distribution as they occur across the population (Wagstaff, van Doorslaer, and Paci 1989). The concentration index is based on the techniques and indices of progressivity and distributive effect developed in the public finance literature (e.g., Kakwani 1977), and has been applied in relation to both health and health care (e.g., Propper and Upward 1992;Schalick and others 2000;van Doorslaer, Wagstaff, and Bleichrod 1997).…”