Investigating the Relationship Between Bid-Ask Spread and Depth of Market in Tehran Stock Exchange

This study investigate the relationship between Bid-ask spread and depth of market in Tehran Stock exchange. The main objective is to answer that “wheter there is the relationship between bid-ask spread and the debth in market”. The statistic community are companies in TSE. We select48 companies from these statistic communities during 1387-91 by restricting the companies that meet some criteria for doing the research.we have used two categories of information for studyng the above mentioned objective.The first is library and the second is secondary data.We used two variable as control varibles; size and valume. For assessing research hypothesize the software “SPSS”; liner regression were used. the findings show not significant relationship between undependent variable and control variables with dependent variable.