Audit firm industry specialization and audit outcomes

Audit firms vary with respect to the quality of services they provide to their clients. One differentiation strategy is related to providing services to clients that are based on in-depth industry knowledge. Industry specialization helps audit firms increase the demand for audit and non-audit services، improves audit efficiency through economies of scale، creates barriers to entry by requiring new entrants to invest significant resources in relevant industries، and affects client-relevant audit outcomes like audit fees and financial reporting quality. This review attempts to evaluate critically the archival research on the effect of audit firm industry specialization on client-relevant audit outcomes. Some suggestions for future research are offered.