“…Following previous studies, we include a set of control variables for different aspects of audit complexity, which can have an impact on firm's demand for audit quality. To control for organizational complexity we define the variable SIZE as a natural logarithm of total assets, and the variable GROUP, indicating whether the firm belongs to a corporate group (i.e., the firm is a parent company, a subsidiary or a jointly controlled company) (Knechel et al, 2008). To control for the transactions complexity, we define the variable A_TURN as a ratio of sales to total assets, and the variable EXPORT, indicating whether the firm has foreign sales (Chaney et al, 2004).…”