Stock Price Changes and Trading Volume

The purpose of the present research is to investigate the relationship between stock price changes and trading volume in companies accepted at the Tehran Stock Exchange. The trading volume describes the consistency and accuracy of the price. In fact، any study that would not consider trading volume along with price changes، is not taking into account the price accuracy. Therefore، after a comprehensive review of the subject in the relevant literature، tests of variables correlation were conducted on samples of 70 companies in three high transaction industries. The results indicated that there are correlations in market structure. Trade frequency، the number of traded stocks and daily price changes، had positive correlations with one another. These correlations also exist in the interval of one day. So the price changes are caused by trade frequency and the number of stocks traded the day before. Furthermore، the price changes follow ascending or descending trends during consecutive days.