Yesterday, we got news that South Korea's exports dropped 14.7% since last August...their largest decline since the financial crisis. It's far worse than the 5.9% drop economists were expecting.

South Korea's exports are important because they're considered a "canary in the coalmine" for the global economy. South Korea is a major exporter to the largest economies in the world including China, the US, and Japan. South Korea also releases its export numbers much earlier than other major countries. That's why a bad reading for South Korean exports is often the first sign that the global economy is in trouble.

The ugly news slammed stocks around the world. Chinese stocks dropped 1.3%…Japanese stocks dropped 3.8%…and the major indexes in Germany, the United Kingdom, France, and Spain all lost at least 2%.