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주식시장과 외환시장 간의 정보 이전효과: EGARCH 접근

Information Flow Effect Between the Stock Market and the Foreign Exchange Market: An EGARCH Approach

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참고문헌

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주제분류경제학

초록

본 연구에서는 주식시장과 외환시장 간의 가격이전효과(price spillover effect)와 변동성 이전효과(volatility spillover effect)를 분석하였다. 비대칭적 변동성을 고려하기 위해 EGARCH (exponential generalized autoregressive conditional hetero- skedasticity) 모형을 사용하였으며, 전체분석대상 기간을 시장평균환율 제도를 도입한 1990년 3월 2일 이후부터 외환위기 이전, 외환위기 기간, 그리고 외환위기 이후 기간으로 세분하여 실증분석을 시도하였다. 실증분석의 결과에 의하면 국내 주식시장과 외환시장 간에 가격이전효과와 비대칭적 변동성 이전효과가 있는 것으로 나타났으며, 외환위기 이후 두 시장의 상호연관성이 증대된 것으로 나타났다. 주식시장에서 외환시장으로의 음(-)의 가격이전효과는 전 기간에 걸쳐 나타났으며, 비대칭적 변동성 이전효과는 외환위기 이후 기간부터 나타났다. 외환시장에서 주식시장으로의 음(-)의 가격이전효과는 외환위기 기간부터 나타났으며, 비대칭적 변동성 이전효과는 외환위기 이후 기간부터 나타났다. 또한, 외환위기 이후 주식시장(외환시장)의 외환시장(주식시장)으로의 비대칭적 변동성 이전효과를 분석한 결과 각 시장의 호재(good news)보다는 악재(bad news)에 대해 더 민감하게 반응하는 것으로 나타났다.

Abstract

Using EGARCH(exponencial generalized autoregressive conditional heteroskedasticity) method to consider asymmetric volatility effects which are widely observed in the stock market and the foreign exchange market, we empirically investigate whether these two markets have price spillover effects and volatility spillover effects each other. Based on daily stock prices and the won/dollar exchange rates, we find that there are price spillover effects during the full sample period and asymmetric volatility spillover effects after a financial crisis period. Moreover, volatility spillover effects have much more increased when bad news come to the markets.

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