At the start of a new week and a new year, investors have plenty to think about.  Despite the rollout of vaccines, the pandemic has worsened in recent weeks, dragging on the global economy.  U.S. stock markets ended at record highs on Friday and both bond and equity valuations look lofty.  And in the week ahead, the Congress will certify the election of Joe Biden as President, although with an unusual degree of political acrimony.