Every so often, Wall Street reminds investors that stocks don't move higher in a straight line. Sometimes, these reminders are anything but subtle. Over the last two weeks, investors have witnessed volatility akin to the COVID-19 crash of February-March 2020, as well as during the height of the financial crisis in 2008. On one end of the spectrum, the Dow Jones Industrial Average, S&P 500, and Nasdaq Composite all logged their largest individual point gains on April 9 since their respective inceptions. Conv ...