If Friday's non-farm payrolls report is weak, a correction in U.S. stocks could begin to gain traction, according to Scott Rubner of Goldman Sachs. Rules-based systemic funds such as Commodity Trading Advisers (CTAs) now have an asymmetric downward bias for the month ahead, "This is the last week of non-emotional demand," Rubner wrote. CTAs could sell $17.38 billion of U.S. stocks in flat markets; up markets could sell as much as $3.73 billion, while stock market declines could lead to a sell-off of up to $65.55 billion.