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 Should You Invest in Exchange Traded Funds? There are hundreds of ETFs available. Should you invest in them? Investing with Your Heart For some, the social impact of investing is just as important as the return, perhaps more important. 5 Smart Investing Strategies Getting what you want out of your money may require the right game plan.