The 2017 calendar year provided one of the most beneficial runs the stock market has endured in decades. It seemed like each new day brought a new record-high close. However, that wild ride upward had to meet an end at some point. There are a lot of reasons that markets can cool off, ranging from jarring events such as a singular, massive selloff to the geopolitical strife that riles the nerves of investors. In early 2018, the markets experienced a severe correction.