이변량 GJR-GARCH모형을 이용한 국제통화선물시장과 통화현물시장간의 비대칭적 인과관계 및 시장효율성 비교분석에 관한 연구
An Empirical Study on the Asymmetric Correlation and Market Efficiency Between International Currency Futures and Spot Markets with Bivariate GJR-GARCH Model
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초록
본 연구는 영국 파운드, 캐나다 달러, 호주달러, 원달러 및 브라질 레알화 통화선물시장과 현물시장 수익률사이의 선도-지연관계, 변동성의 비대칭적 인과관계 및 시장효율성을 비교분석하였다. 각 통화 현·선물시장 수익률간의 선도 지연관계 분석을 위하여 VAR(vector auto regressive)모형에 기초를 둔 Granger 인과관계분석을 실시하였으며 변동성의 비대칭적인 정보전달메커니즘 분석은 시간변동 MA(1)-GJR-GARCH(1, 1)-M모형을 도입하였다. 주요 실증분석결과는 다음과 같다. 첫째, Granger 인과관계분석결과 각 통화선물 및 현물시장사이에는 피드백적인 인과관계가 존재하는 것으로 나타났다. 각 통화선물시장의 현물시장에 대한 가격발견기능이 통화현물시장의 선물시장에 대한 영향력보다 상대적으로 더 높은 것으로 나타났다. 둘째, MA(1)-GJR-GARCH(1, 1)-M모형을 추정한 결과, 각국 통화 현·선물시장사이에는 피드백적인 조건부평균이전효과(conditional mean spillovers)가 강하게 존재하는 것으로 나타났으며 전반적으로 선물시장의 현물시장에 대한 영향력이 그 반대의 경우보다 상대적으로 강한 것으로 나타났다. 셋째, 변동성의 비대칭적인 전이효과를 분석한 결과, 각국 모두 통화 선물시장에서 현물시장으로의 비대칭적인 변동성이전효과가 강하게 존재하고 있으며 통화현물시장에서 선물시장으로는 호주달러현물시장을 제외하고 나머지 시장에서는 정보의 비대칭적특성이 존재하는 것으로 나타났다. 이러한 각국 통화선물시장과 현물시장사이의 대칭적·비대칭적 정보이전효과로부터 통화 선물시장이 현물시장에 대한 가격발견기능이 지배적이며 각 통화 현·선물시장은 정보에 비효율적인 시장임을 추론해 볼 수 있다. 이는 주식시장을 연구한 Stoll and Whaley(1990), Abhyankar(1995), Brooks et al.(2001) 등의 연구와 일맥상통하는 것으로 나타났다.
Abstract
This paper tested the lead-lag relationship as well as the symmetric and asymmetric volatility spillover effects between international currency futures markets and cash markets. We use five kinds of currency spot and futures markets such as British pound, Australian and Canadian dollar, Brasilian Real and won/dollar spot and futures markets. daily closing prices covering from September 15, 2003 to July 30, 2009. For this purpose we employed dynamic time series models such as the Granger causality based on VAR and time-varying MA(1)-GJR-GARCH(1, 1)-M. The main empirical results are as follows;First, according to Granger causality test, we find that the bilateral lead-lag relationship between the five countries’ currency spot and futures market. The price discover effect from currency futures markets to spot market is relatively stronger than that from currency spot to futures markets. Second, based on the time varying GARCH model, we find that there is a bilateral conditional mean spillover effects between the five currency spot and futures markets. Third, we also find that there is a bilateral asymmetric volatility spillover effects between British pound, Canadian dollar, Brasilian Real and won/dollar spot and futures market. However there is a unilateral asymmetric volatility spillover effect from Australian dollar futures to cash market, not vice versa. From these empirical results we infer that most of currency futures markets have a much better price discovery function than currency cash market and are inefficient to the information.
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