급첨 분포와 옵션 가격 결정
Option Pricing with Leptokurtic Feature
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초록
본 연구는 기초자산의 수익률이 정규분포가 아닌 급첨분포(leptokurtic distribution)를 따른다고 가정할 경우 옵션의 가격식을 도출한다. 두 정규분포의 확률밀도함수의 선형 결합으로 첨도가 3이 아닌 급첨분포의 확률밀도함수를 모델링하고 이를 이용하여 Black- Scholes 공식의 확장된 형태인 옵션 가격 공식을 유도한다. 본 논문에서 제시한 급첨분포에 의한 옵션가격모형은 변동성 스마일 성질을 설명할 뿐만 아니라 기존의 실증연구에서 제기된 Black-Scholes 옵션가격의 과대 및 과소평가 현상을 설명한다. 마지막으로 본 가격식의 모델적합성을 검증하기 위하여 KOSPI 200 지수옵션의 시장가격으로부터 내재변동성과 내재첨도를 추정한다.
Abstract
This purpose of paper is to propose a European option pricing formula when the rate of return follows the leptokurtic distribution instead of normal. This distribution explains well the volatility smile and furthermore the option prices calculated under the leptokurtic distribution are shown to be closer to the market prices than those of Black-Scholes model. We make an estimation of the implied volatility and kurtosis to verify the fitness of the pricing formula that we propose here.
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