XLF is a financial sector ETF. JPM is a huge bank. If JPM does badly, XLF should probably do badly, and vice versa. Then it stands to reason that if JPM falls b

XLF is a financial sector ETF. JPM is a huge bank. If JPM does badly, XLF should probably do badly, and vice versa. Then it stands to reason that if JPM falls below XLF, it will soon go back up to where XLF is. This is relative, so the same situation with XLF rising above JPM, and JPM catching up/XLF falling back down, and similar situations.