7. Conclusion and Recommendation
The objective of this study was to examine the impact of agency cost of non-audit services using a sample of
manufacturing and service companies listed in ASE for the year 2010. The result of the study revealed that there
is positive and significant relation between both company size and leverage and non-audit services. Overall, the
result of the study concluded that agency cost has no effect on the demand for NAS. Based on the finding of this
study, the current study recommends future studies to investigate the impact of other mix of variables especially
corporate governance variables to study the current objective. Furthermore, the current study provide basement
for other studies to investigate whether the existence of non-audit service affect independence of external audit.