Miled Wafa, Ftiti Zied, Sahut Jean-Michel
GEF2A-Lab, Higher Institute of Management of Tunis, University of Tunis, Tunis, Tunisia.
OCRE-Lab, EDC Paris Business School, France/University of Tunis, ISG-T, LR GEF2A, Tunis, Tunisia.
Ann Oper Res. 2022;313(2):1183-1220. doi: 10.1007/s10479-021-04223-9. Epub 2021 Sep 1.
The objective of this paper is to identify the presence, direction and time at which the pure contagion effect occurred between financial markets. In so doing, the aim is to prove the existence of both spatial and temporal asymmetries of pure contagion effects. Firstly, a new empirical framework is proposed in order to define a spatial contagion index using the conditional cumulative distribution function as a parameter to estimate a conditional copula. This methodology enables us to estimate a dynamic conditional copula, providing information about how the market sent pure contagion effects and when. Secondly, in addition to detecting the direction of contagion, the real-time contagion effect is determined, enabling us to calculate the delay of contagion effects (spillover) between financial markets. The present empirical results show the existence of both spatial and temporal asymmetry for bilateral contagion effects for 16 mature and emerging stock markets during the 2001-2018 period. This proves the importance of taking temporal asymmetry into account when we want to detect the contagion effect of every crisis and to estimate the period of pure contagion relating to investors' behaviors. Finally, these findings highlight the fact that contagion effects were more intensive during the subprime crisis than they were during the European debt crisis.
本文的目的是确定金融市场之间纯粹传染效应出现的情况、方向和时间。这样做的目的是证明纯粹传染效应在空间和时间上的不对称性。首先,提出了一个新的实证框架,以便使用条件累积分布函数作为参数来定义空间传染指数,以估计条件copula。这种方法使我们能够估计动态条件copula,提供有关市场如何以及何时发送纯粹传染效应的信息。其次,除了检测传染方向外,还确定了实时传染效应,使我们能够计算金融市场之间传染效应(溢出)的延迟。目前的实证结果表明,在2001 - 2018年期间,16个成熟和新兴股票市场的双边传染效应在空间和时间上都存在不对称性。这证明了在我们想要检测每次危机的传染效应并估计与投资者行为相关的纯粹传染期时,考虑时间不对称性的重要性。最后,这些发现突出了一个事实,即次贷危机期间的传染效应比欧洲债务危机期间更为强烈。