Efficiency and Productivity in Tehran Stock Exchange based on Diversification Strategy

In recent years, corporate diversification has turned into a highly controversial issue amongst numerous managers. It is contended by many that diversification is vitally important and highly effective especially when it comes to evaluating the financial performance. There are several studies about the relationship between diversification and financial performance. However, there is no agreement that diversified firms are more efficient than focus firms. In this study, the listed firms in Tehran Stock Exchange are ranked based on their efficiency scores calculating by Data Envelopment Analysis (DEA) models. Then, by slack analysis, the proposed improvement strategies for inefficient firms have been cited. Ultimately, the Malmquist index of productivity (MIP) has been utilized to further comparison and analysis.