In this study, the relationships between the changes of the economic leverage and the operational performance of the accepted companies of Tehran's stock market were analyzed. The main goal of this study is to determine if there is a meaningful relationship between the changes of the economic leverage and the operational performance of the accepted companies of Tehran's stock market. For this purpose, 145 companies from 2005 to 2006 with systematic elimination method were selected. The results

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... ndicated that there was a meaningful relationship between the economic leverage and the stock price. The results showed that an increase in the debt led to an increase in the relationship between the economic leverage and the stock price. Also, the study showed that the relationship between the economic leverage and the stock price is a meaningful and negative relationship. Finally, the study indicated the change of the economic leverage and the ratio of expenses to property is a negative and meaningful relationship.