A Study on the Volatility Spillover Effect of Stock Index Using Rolling Asymmetric VAR-BEKK-GARCH Model : Focusing on the Chinese Market
본 연구는 Rolling Asymmetric VAR-BEKK-GARCH 모형으로 한·중·일·미 4개 주식 시장 변동성의 비대칭 전이효과를 분석하였다. 연구는 시장 변동성의 정태적인 전이 효과뿐만 아니라 시간가변적인 비대칭 전이효과를 파악하였다. 분석 결과에 따르면, 중국 시장 호황기에는 비대칭 변동성 전이효과의 부호가 대체로 음(-)으로, 시장 불황기나 불안정 시기에는 양(+)의 부호로 나타났다. 또한, 한국, 일본, 미국 등 시장의 충격이 중국 시장 변동성에 대한 영향은 비교적 일관된 방향성을 보이며, 반면에 중국발 충격이 타 시장의 변동성에 미치는 영향은 시간가변적인 특징을 나타냈다. 이는 중국 금융 시장의 동태적 특성을 파악하는 데 유의미한 시사점을 제공할 수 있다.
This study employs the Rolling Asymmetric VAR-BEKK-GARCH model to empirically investigate the asymmetric spillover effects of stock index returns and volatilities among major markets, including China, Japan, and the United States. The analysis reveals that asymmetric volatility spillover effects within the Chinese stock market exhibit diverse patterns over time. Notably, during periods of market upturns, these effects tend to have a negative sign, indicating that unexpected adverse shocks reduce conditional volatility. Conversely, during market downtrurns or periods of instability, these effects exhibit a positive sign, suggesting that unexpected negative shocks amplify conditional volatility, particularly when investors demonstrate heightened sensitivity to unfavorable events. Furthermore, the findings indicate that the volatility of the Chiense stock market consostenly reflects the impact of shocks emanating from major markets such as Korea, Japan, and the United States. However, the spillover effects of shocks originating in China on other markets are characterized by greater variability, highlighting the complex and dynamic interplay between the Chinese market and global financial systems. This study provides valuable insights into the time-varying nature of asymmetric volatility spillvoer effects and emphasizes the importance of considering the temporal dimension when analyzing market interactions. The findings also underscore the need for market paricipants and policymakers to closely monitor the shocks orginating form the Chinese market and their impact on other markets to promote financial stability and effective risk management in an increasingly interconnected global economy.