Market recap: Stocks suffered their worst day of the year after woeful U.S. jobs data make it clear the economy "isn't just slowing down, it's pulling up the emergency brake." The Dow is now negative YTD, and the S&P breached its 200-day MA. Treasurys and gold were the day's go-to holdings; 10-year yields slipped below 1.5%. Crude oil plunged to $83.23. NYSE losers led winners five to one.