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This paper aims to explore how the presence of an audit committee is associated with other corporate governance mechanisms, i.e. board structure, ownership structure and quality of external audit. The present study evaluated whether the presence of the audit committee complements or substitutes other governance mechanisms in Palestinian companies. Moreover, the effect of investment opportunities on the relationship between the formation of the audit committee and the quality of the auditor was addressed.

The association between the formation of the audit committee and other governance variables was modelled as a binary logistic model. The sample comprising 44 firms listed on Palestine exchange for the period between 2013 and 2017, amounting to 220 firm-year observations.

Based on the investigation, the results have indicated that board independence, the distinction between the chairman and chief executive officer function, ownership concentration and audit quality enhance the chance of audit committee formation, implying complementary effect. Contrastingly, board size and board ownership serve as a substitute to audit committee formation. It has also been found that investment opportunities act as an effective moderating factor that strengthens the relationship between audit quality and the formation of the audit committee.

The study provides valuable insight into the interaction between multiple corporate governance mechanisms within the economy of Palestine where the external uncertainty is high and investment opportunities are constrained by the decisions of the occupying authority. The findings may help regulators and policymakers in Palestine alongside those of other countries with similar environmental features to revise and update their corporate governance codes to ensure that the best control can be achieved, subsequently attracting more foreign and domestic investments.