With the biggest shopping weekend of the year behind us, it is being reliably reported that retail sales cratered — down 11% from last year. Christmas shopping is of course crucially important to a U.S economy that is 70% driven by consumption. You do the math. Despite this, index futures were down only marginally Sunday night, suggesting either that traders had not done the math themselves, or that they were doing their weasely best to prop up the markets until morning.