However, because the securities are inflation-protected, the average duration somewhat overstates the influence of rate increases or decreases on the fund's value. With annual expense ratios of just 0.24%, these funds remain a very affordable way to hold corporate bonds and minimize interest rate risk. A secret billion-dollar stock opportunity The world's biggest tech company forgot to show you something, but a few Wall Street analysts and the Fool didn't miss a beat: There's a small company that's powering their brand-new gadgets and the coming revolution in technology.