Stocks finished close to their early lows Friday as trade remained weak heading into the three-day Labor Day holiday. The Dow Jones industrial average ended down 1.7%. The S&P 500 booked a 1.5% slip and the Nasdaq shed 1.1%. August payrolls set the early tone on the stock market today, as job growth undercut expectations by a wide measure. Steel producers and oil drilling contractors posted the session’s heaviest losses among industries.