What gives when that happens? It is one thing when they don't quite track at 2x percentage change for the day, it is another when they are moving different directions altogether. To my mind, if MORL is ever going the opposite direction of MORT, something is wrong in the market and there ought to be an arbitrage opportunity. But maybe I am missing something. And I guess just because something ought to be doesn't mean it is.
Anyone have a good explanation why this ought to happen in an efficient rational market?