Global markets are trading mostly lower at the moment after reaching record highs in recent days. Investors are somewhat cautious today amid the ongoing political crisis in Spain and due to memories of the Black Monday collapse of 1987 that occurred exactly 20 year ago. In the U.S., discussions continue on who will be the next Fed Chair after Janet Yellen’s terms is finished. Elsewhere, China published a weaker GDP data as was widely expected. Here are the big things to know for today’s trading.