We
attribute these results to competition between the auditors.
Our results clearly confirm previous findings of a positive
association between other fees and audit fees. On balance, we
find the core audit fee determinants model to be well specified
for the Danish data, although small companies seem to differ
somewhat from large companies. Finally, we find no additional
Big Four effect from the appointment of a second Big Four
auditor. However, our results indicate that the use of PWC is
associated with lower audit fees in large companies and higher
audit fees in small companies.