The US markets seesawed on Thursday before closing lower as investors weighed up strong fourth quarter economic news against the impact of the Fed?s monetary policy on corporate profits and stock valuations. Apple rallied after hours following the release of first quarter results after the closing bell on Thursday. For the period, Apple beat expectations and reported record revenue, profit and an increase in iPhone revenue despite the global chip shortage crisis. A spotlight on Intel as the chipmaker tumbled 7% on Thursday despite reporting better-than-expected fourth quarter results and delivering upbeat guidance. Elon Musk has announced that Tesla will prioritise the development of the humanoid robot over vehicle innovation in 2022.