5. Conclusions
This paper explores whether the reduction in audit fees due to the 2008 financial crisis has affected audit quality. The factors that were posited as potentially affecting audit quality were the audit fees, other fees charged by the auditor (e.g., consulting fees), explanatory paragraphs, audit report qualifications, and emphasis of matter. The latter three factors may be included in the auditor's report if deemed necessary. The indicator used to represent audit quality was the EBITDA. The empirical study was conducted using fsQCA, which was used to identify the factors that led to positive or negative changes in EBITDA. This method was chosen because it provided a perspective of complex causality, testing asymmetric relations among observations. Using fsQCA also made it possible to obtain valid results with small datasets (Fiss, 2007). This was the case in the present study, in which data for 37 Spanish firms in the IBEX 35 of the Madrid Stock Exchange were analyzed for the years 2008 and 2015.