The relationship between the debt contract and the speed of adjustment of the capital structure

Usually, companies deviate from their target capital structure And may only take time to adjust their capital structure The benefits of this adjustment are more than its cost. The purpose of this study is to investigate the relationship between debt contract with two indicators (long-term debt to total assets) and (total debt to equity) with the speed of capital structure adjustment.To achieve this goal, a sample of 102 companies listed in Tehran Stock Exchange was selected using systematic elimination method.And have been tested over a period of eight years from 2009-2014. This research consists of a main hypothesis and two sub-hypotheses that have been tested using the generalized torque regression method. The results of the hypothesis test showed that after adding the index (long-term debt to total assets) to the original model Dang et al. (2012), the rate of capital structure adjustment was 10% and after adding the index (total debt to equity) Has increased to 6%, which confirms both the hypothesis.