Welcome to Morning Brief presented by Robin Hood, the home to commissionfree trading. I'm Yahoo Finance executive editor Brian Sazi. Let's fire up the three things you need to know right now.First up, stocks are a little change on this holiday shortened trading day after the S&P 500 closed at a record high. Investors officially on Santa Claus watch. The Santa Claus rally is any market gains for the last five trading days of December and the first two trading days of January.We are now in that zone and commo ...