Fitch's U.S. Debt-Rating Downgrade Is Bad News for Stocks. Here's Everything You Need to Know. Investors had been enjoying a nearly perfect year in which the S&P 500 and Nasdaq had racked up massive gains. Previous Article 3 Business Lessons I Learned From Playing Video Games Next Article Mark Zuckerberg Says He Needs to Eat 4,000 Calories Daily. Here's What Might Be on the Billionaire's Menu — From Quarter Pounders to Chocolate Mice.