Investors brace for the 'September effect,' Kraft-Heinz to split into 2 companies

Welcome to Yahoo Finance's flagship show, The Morning Brief. I'm Julie Hyman. Let's get to the three things you need to know today. First up, Wall Street kicking off a new month after gains across the board in August. US stock futures currently pointing to a lower open as investors return from a long holiday weekend. September historically the worst month for stocks, and the trend has gotten worse in recent years. Over the past 5 years, the S&P 500 has averaged a 4.2% drop in September. So investors are see ...