신용평가기능 개선을 위한 과제
Restoring the Role of Credit Rating Agencies as Gatekeepers
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서브프라임 모기지 및 구조화 상품 등에 대한 부정확한 신용등급은 최근 금융위기 확산의 주요 요인으로 지적되고 있다. 본 논문은 신용평가노력을 관찰할 수 없는 숨겨진 행동모형(hidden action model)을 통해 신용평가회사의 행태 및 규제에 대한 분석을 시도하여 현재 논의되고 있는 신용평가기능 개선을 위한 논의에 보완적인 기여를 하고자 한다. 분석 결과, 도덕적 해이가 존재하면 신용평가노력이 관찰 가능하지 않음으로 인해 사회적으로 최적인 수준보다 낮은 수준의 신용평가노력을 기울임을 확인하였다. 경쟁 및 평판효과를 고려한 확장된 모형의 경우에도 신용평가회사에 사회적으로 최적의 유인을 제공하는 데는 한계가 존재한다. 그리고 부수업무의 존재는 신용평가회사의 노력수준과 사회적 최적 수준 간의 괴리를 확대함을 확인하였다. 따라서 경쟁과 평판에 의한 규율이 불완전한 경우 신용평가회사에 대한 감독 및 잘못된 정보의 제공에 따른 책임의 부과가 필요하다.
Abstract
Credit rating agencies(CRAs) are accused of failing to provide accurate and fair credit ratings and hence being responsible for the crisis. This paper tries to add on to the literature on credit rating reform through examining the CRAs in a model where rating quality is unobservable. We show that unobservability of rating effort results in the sub-optimal level of quality. Then the paper extends the model to incorporate ancillary services, competition and reputation. We show that ancillary services worsen the conflict of interests of the CRAs and that competition and reputation may not be strong enough to discipline the CRAs. Hence regulatory oversight and imposition of liability may be necessary in order to increase the accuracy of ratings.
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