WASHINGTON — Federal Reserve officials pledged to help the economy through the painful pandemic era, making clear at their final meeting of the year that the central bank would continue cushioning businesses and households by keeping interest rates at rock bottom and buying government-backed debt for the foreseeable future.The Fed’s chair, Jerome H. Powell, said at a news conference after the meeting that the central bank would keep its effort to bolster demand going “for some time,” adding that the “the next few months are likely to be very challenging.”The Fed cut interest rates to near-zero in March …
