Interest Rates: How Low Can They Go? The question used to be, “How low can interest rates go?” Now it's, “How long can rates remain at their historic low levels?” Share | Related Content What Smart Investors Know Smart investors take the time to separate emotion from fact. Earnings for All Seasons Earnings season can move markets. What is it and why is it important? 5 Smart Investing Strategies Getting what you want out of your money may require the right game plan.