“…In addition, we also use some other representative stock indices of Chinese market and the U.S. market, including the Shanghai Composite Index, the Shenzhen Component Index, and the CSI 1000 Index from Chinese market, as well as the Dow Jones Industrial Average Index, the NASDAQ Composite Index, and the Russell 2000 Index from the U.S. market. 9 For instance, [3] [4] [14] [15] [16] [29], and [31] carry out their tests of LETF performance based on the funds listed on developed countries. Actually, most of these studies use the data of U.S. LETFs.…”