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Abstract The only observable outcome of the audit process is normally the issued audit report, which, at least in its standard form, does not contain much information about audit quality (Balsam et al. 2003). Auditor quality is multidimensional and inherently unobservable, and there is no single auditor characteristic that can be used as a proxy for it. In the absence of direct measures for quality, audit consumers must assess the quality by using quality surrogates, or the overall reputation of an auditor (e.g. Shapiro 1983, Riley 2001). The purpose of this dissertation is to enhance our understanding of the determinants and implications of quality-differentiated audits through four inter-related essays. The findings of the essays shed light on the various ways in which client firms strive to signal high audit and consequent earnings quality. From the supply-side perspective, the essays of this dissertation provide evidence how some (individual) auditors have been able to establish a reputation higher than the generic reputation. Importantly, this dissertation adds to the ongoing debate about the regulator changes and initiatives in the European Union and the U.S.A. requiring disclosure of engagement partner identity. The rationale behind such a requirement is that it could bring within investors’ reach greater transparency and accountability in the auditing process thereby helping to restore investor confidence in the capital markets. Consistent with this rationale, the results of this dissertation support the view that audit markets (and/or firm insiders) infer audit quality, at least to some extent, from the characteristics of the individual audit partner in charge.

Different scandals around the globe during the past, in specific during the last decade, have intrigued the stakeholders to question the roles of both auditors and management. But most of the fingers since then have been raised on the role of auditors, because it is the auditors who are entrusted with the responsibility to detect any errors or frauds in the financial reports of the client-firm. Apart from this, the long-term auditor client relationship has been the center of attention in most of the discussions and debates as well. Numerous studies have been conducted by the academic researchers, financial and professional analysts, regulatory authorities and governing bodies, and in some cases by the auditors and the firms as well regarding the effects of long-term auditor-client relationship on audit quality, equity risk premium, financial reports quality, audit pricing etc. These studies provide us with different results, both with the positive and negative associations and effects of long-term auditor-client relationship on the basis of different factors and contexts. For long, auditing has been discussed in different studies and research areas but mostly in association with publicly listed companies. Less attention has been paid to the relationship of auditors and clients as far as clients in SMEs are concerned. In any country around the globe, SMEs are of major contribution in terms of backing the economy, giving it both the boost and the stability, as they collectively form the major chunk of the economy. If we specify our study to the SMEs in Sweden, then 99% of the enterprises in Sweden represent the SME sector; in addition they employ around 60% of the manpower. Based on these facts, and due to less attention given to auditor-client relationship in terms of SMEs, instead of; we have directed our concerns towards the study of effects of auditor-client relationship on audit quality in SMEs in this particular research study. In this study, we have opted for qualitative research with semi-structured interviews to be used as the tool for data collection. Interviews were conducted with two different groups of interviewees, one group representing the auditors and the other group representing the client-firms (SMEs). A total of seven interviews were conducted in order to strengthen and validate the results for our research question. Due to the limitations of this study, mostly in terms of cost and time, samples were selected from Umeå, Sweden. The data interview structure, data analysis and discussion, and conclusions were all made based on existing theories summarized in the theoretical review of this study. The results of this study suggests that (1) long-term audit tenure is beneficial for the audit quality if certain risk factors like risk of auditor independence and risk of developing complacency are controlled; and (2) factors such as NAS, industry specialization, knowledge and experience of the auditor, internal control in the client-firm, professional ethics, proper audit plan, providence of unbiased information by the client, and appointment of the auditor by the client-firm itself enhances the audit quality.

本研究主要探討審計品質與盈餘反應係數之關係，擬回達下列之研究問題：接受高品質會計師事務所查核之公司，其盈餘反應係數是否較接受低品質會計師事務所查核之公司為高。 　　本論文以台灣股票市場民國70年至82年之更換會計師公司為樣本，首先採用未預期盈餘(UE)與股票市場累積異常報酬(CAR)的簡單迴歸分析，嘗試驗證盈餘資訊與股票報酬間之關係；採用盈餘反應係數決定因素的複迴歸分析探討審計品質是否會影響盈餘反應係數。實證結果顯示： 　　一、如以曾經由六大會計師事務所查核財務報表更換為非六大會計師事務所之上市公司，或曾經由非六大會計師事務所更換為六大會計師事務所查核簽證財務報表之上市公司為樣本公司，台灣股票市場之未預期盈餘與異常報酬間方向是一致的，但並不具統計顯著性。 　　二、審計品質是否會影響盈餘反應係數之實證結果：六大會計師事務所客戶之盈餘反應係數是大於非六大的客戶，但亦並不具顯著性。 　　換言之，以國內會計師事務所與美國六大結盟作為衡量高品質的審計品質，其與盈餘反應係數之關係並未如預期呈顯著的正相關。