Dynamic volatility spillover and network connectedness across ASX sector markets

This study measures dynamic volatility spillovers and identifies the connectedness network across 11 Australian Securities Exchange (ASX) sector indices using the spillover index methodology of Diebold and Yilmaz (J Econ 182:119–134, 2014). Additionally, we visualize volatility connectedness relationships as links within a complex network to capture the propagation path of volatility connectedness across the 11 ASX sectors. Our results indicate that recent financial crises intensified the degree of volatility connectedness across the 11 ASX sectors, supporting the contagion hypothesis. Importantly, the financial sector is the main transmitter of volatility connectedness across the 11 ASX sector markets.