Investigating the Relationship between Disclosure Level and equity cost in Tehran Stock Exchange Listed Companies

In this research، we investigated the relation between three variants of disclosure level including reliability، punctuality and marginal disclosure with equity cost in companies listed in Tehran Stock Exchange with the approach of executive regulations of disclosing the information of companies registered with the Securities and Exchange organization approved in 2007. The general objective of this research is to analyze the impact of information submitted by companies and the disclosure level of this information on the expectation of investors as well as the equity cost. This research on the basis of such approach is tending to investigate and achieve the aforementioned relationship.