Value Relevance of Accounting Information over Time: The Case of Tehran Stock Exchange *

Accounting scholars have shown great interest to value relevance (Beaver، 2002). Since 1990، researchers in this field of study have examined what type of accounting information is considered relevant and if it has changed over time. Researchers seek answers to this question have reached different conclusions. Answering to the question of how value relevance of accounting information in Tehran Stock Exchange has changed over time is the basic issue of this study. To do this، under the prediction and the measurement view of value relevance، we examine value relevance of accounting information of 95 firms over 11 years using regression. The results show under none of this views we can’t reject the research hypothesis based on the reduction of accounting information over time and the use of alternative independent variables، under the two different approaches to value relevance of accounting information، has not any impact on this result.