there is a significant positive effect between the debt 
to asset ratio and the agency cost with a coefficient 
of 0.1778. The long term debt to asset ratio, 
managerial ownership, and board size do not have a 
significant effect to agency cost with a probability 
value of more than 0.05. 
The result of the first hypothesis (Ha1) was 
supported by Hastori et al., (2015) but was not 
supported by Zheng (2013). The test result showed a 
positive relationship and indicates that debt can 
increase agency costs. This positive relationship can 
be caused by the use of high debt in manufacturing 
companies in Indonesia which can be seen from the 
percentage of average debt (49.40%). This high debt 
can cause a  threat of bankruptcy to the owner  
because of the possibility of financial distress. This 
will encourage shareholders to spend more to 
prevent defaults and can increase monitoring costs. 
Additionally, it will increase agency costs.  
The result of the second hypothesis (Ha2) did not 
show any significant influence of long term debt to 
asset ratio on Agency costs. This is in line with the 
research conducted by Zheng (2013). Low average 
debt ratio with a percentage of 19% indicates that 
the company does not use a lot of long-term debt to 
finance their assets, so there will be no significant 
increase of agency cost.  
The result of the third hypothesis (Ha3) indicates 
that there is no significant effect of managerial 
ownership on agency costs. This is in line with the 
research conducted by Putri and Nasir (2006) and 
Singh and Davidson (2003), but not in line with 
Yegon, Sang, and Kirui (2004). The absence of a 
significant effect can be caused by the low number 
of managerial ownership in the Indonesia Stock 
Exhange. The average managerial ownership in the 
Indonesia Stock Exhange is only 1.65%. 
The result of the fourth hypothesis (Ha4) was 
that the board size variable shows no significant 
effect on agency costs. The result of this study was 
in accordance with the research proposed by Singh 
and Davidson (2003), Kung’u and Munyua (2016), 
and Flemming (2003). In its decision making both in 
large and small sizes, the board of directors will 
continue to experience conflicts of interest in order 
to prosper themselves because of their position as 
agents in the agency theory, so the board size cannot 
have an impact in reducing agency costs. 
5 CONCLUSION 
From the results of this study, it can be concluded 
that the debt of the company can prevent any 
wasteful behavior by the manager for his personal 
interests. Cash flow generated from the company's 
business activities must be prioritized to pay interest 
expense and company debt. Therefore, proper debt 
and capital proportions are needed so that the agency 
costs incurred by shareholders can be minimal.  
Limitations in this study include: (1) the 
population of data only includes companies engaged 
in manufacturing industries listed on the Indonesia 
Stock Exchange in the 2014-2016 period, (2) agency 
cost is very difficult to measure so this study uses a 
proxy ratio of general and administrative expense as 
a proxy.  
Based on the results and limitations that have 
been explained, the suggestions that can be given to 
further researchers are: (1) to add sectors other than 
manufacturing companies as sample data and (2) to 
use another measurement as a proxy of agency cost. 
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