From David Fabian: Income investors are currently facing an uptick of concern over bond holdings that is reminiscent of the 2013 taper tantrum.While it was no more than a few years ago, many are quick to forget the terror that resulted from a sharp rise in Treasury yields and concomitant fall in bond prices. I can also starkly remember just how wrong 99% of economists were on predicting the future direction of interest rates in 2014 and beyond.