When the Federal Reserve hiked short-term rates back in mid-December, mortgage rates were expected to increase as well and keep heading north in the new year. But thanks to deep concerns about economic growth in China – not to mention plunging oil prices – all bets are now off. This past week, the price on the benchmark Fannie Mae 3.5 percent security increased by 44 basis points, according to figures compiled by MBS Quoteline. As Inside MBS & ABS went to press ...