... minimum spanning trees (MSTs). Network characteristics were figured out, community detection and network rewiring techniques were also used for extracting meaningful from these MSTs. Findings The findings are, with the evolution of COVID-19, a change in co-movements amongst stock markets' indices...

.... The dynamic copula and pair copula models are applied to capture the dynamic and non-linear correlation structure. Findings – The authors take the enterprise bond with trading data from January 2013 to December 2013 as the research sample. The empirical study of minimum spanning tree shows...