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題名:銀行資本適足率管制之風險資訊內涵暨政策效果
作者:黃德芬 引用關係
作者(外文):Der-Fen Huang
校院名稱:國立臺灣大學
系所名稱:會計學研究所
指導教授:柯承恩
劉啟群
學位類別:博士
出版日期:2001
主題關鍵詞:資本適足率增額及相對資訊內涵選擇權評價模型風險報導信用風險市場風險Capital adequacy ratioIncremental and relative information contentOption pricing methodologyRisk reportingCredit riskMarket risk
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本文旨在探討資本適足率及其組成項目對銀行風險之資訊內涵。其次,亦探討民國87年修正之新制,相對於民國81年之舊制,是否提供了增額資訊內涵;並評估何者更能解釋銀行的風險(更具相對資訊內涵)。最後,探討資本適足率(即以風險為基礎的資本比率),相對於傳統未以風險為基礎的資本比率,是否提供了增額及相對資訊內涵。本文應用選擇權評價模型計算出銀行資產風險,作為衡量銀行總風險之指標;該方法考慮了股東權益之非線性,以及存款保險及管制規定等專屬銀行業之特性。目前,並未要求銀行於年報揭露資本適足率組成項目(我國財務會計準則公報第28號要求銀行於民國89年12月以後必須揭露資本適足率,但未強制揭露組成項目),故本文之資料源自管制機關(銀行每半年必須填報管制機關訂頒之計算方法及表格)。
實證結果發現:(1)資本適足率及其組成項目係評估銀行清償能力之攸關指標;換言之,具風險攸關性。(2)新制之資本適足率相對於舊制,並無增額資訊內涵;然而,就組成項目而言,新制相對於舊制具有增額資訊內涵。此外,以風險為基礎的資本比率,相對於傳統未以風險為基礎的資本比率,具增額及相對資訊內涵。(3)管制所要求計算之信用風險與風險呈正相關;但市場風險則未能解釋銀行風險。(4)就總風險而言,市場對於資本適足率的解讀符合理性預期,但對組成項目則否。基於上述實證結果,本文建議:對於資本適足率資訊,管制機關不應僅是依法執行金融檢查而已,更應與會計準則委員會合作,考慮將該項資訊公開揭露,以增進銀行透明度。
This paper examines the information content of capital adequacy ratio and its components for risk of banks in Taiwan. Also, it investigates whether the new 1998 capital requirement mechanism provides incremental information to assess bank risk compared with the old 1992 mechanism, and evaluates which mechanism is more closely associated with bank risk. Final, it investigates whether the risk-based capital adequacy ratio has incremental and relative information about bank risk compared with the non-risk-based capital ratio (ordinary or traditional capital ratio). This paper employs an option pricing methodology to calculate implied asset risk as a proxy for total risk of banks. This methodology incorporates the non-linearity of equity, deposit insurance, and regulatory rules. Currently, almost numbers of capital adequacy ratio components used in this study are not required annual reporting disclosures. The major findings are: (1) The capital adequacy ratio and its components convey information regarding bank risk. (2) The components of the new capital ratio have incremental explanatory power over the old rules and over the non-risk-based capital ratio. In addition, the new mechanism has greater information content than the old one regarding implied asset risk, and each risk-based mechanism has greater information content than non-risk-based one. (3) Two risk dimensions categorized by regulators, credit risk and market risk, have different explanatory power. There is a positive impact of credit risk exposures on bank risk, but market risk exposures do not. (4) The rationality of risk forecast based on risk-based capital ratio is supported empirically, but it is not hold on disaggregated data (components). Based on the empirical results in this paper, we suggest that regulators and accounting standard setters should require banks to publicly disclose this regulatory information for enhancing transparency of banking.
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