Elham Rezaei hezaveh - Department of Mathematics, Khorramabad branch, Islamic Azad University, Khorramabad, Iran
Reza Fallahnejad - Department of Mathematics, Khorramabad branch, Islamic Azad University, Khorramabad, Iran

The Malmquist Index (MI) is a tool for analyzing the productivity. Considering its importance, different suggestions and studies have been offered on the Cost Malmquist Productivity Index (CMPI) according to existing conditions of decision making units (DMUs) and the available data. The present research aimed to provide a CMPI in a non-competitive environment in which the price data changes from one evaluation unit to another. Given the deficiency of Farrel’s cost efficiency (۱۹۵۷) and also the cost efficiency model presented by Tone (۲۰۰۲), and by taking advantage of the idea of changing the productivity of DMUs at different time periods, we presented cost Malmquist Productivity Index in the presence of non-identical prices for various DMUs, Then, we evaluate the data of the Iranian Stock Exchange by aforementioned Cost Malmquist Productivity index

Data envelopment analysis, Cost efficiency, Malmquist Productivity Index, non-competitive space, stock exchange