The Santa Selloff Continues. All 11 of 11 sectors closed in the red.Here are three reasons that markets lost a short-lived rally on Thursday. Hot economic data: Initial weekly jobless claims for the week ending Dec. 17 rose by 2,000 to 216,000, according to the Labor Department. That’s less than the Dow Jones consensus estimate of 220,000. Weak corporate earnings: $CarMax(KMX)$ shares fell about 3.7% after the company reported weaker-than-expected profit and revenue in its latest quarter. $Micron Technology(MU)$ shares slipped 3.4% after the company reported a wider-than-expected quarterly loss and miss on revenue after the close on Wednesday. Bearish co