don chu gives us a history lesson. >> after what's be te brexit vo, some are anticipating what could k from their vacations an get back to work crisis go back to area, the last six years, stocks became have seen more volatility september, but it ends up being flat. in september, but it's only been a 50-50 split on whether the month was president oba o t duri of september through december, the trends have been more positive. s&p 500 has gained over 4% on of the time.g t health care stocks are among the better performers. meanwhile, energy is among the lagging. now, remember, we're talking average numbers here and time frames do matter. september though remember, filled with potential, market moving like jobs data in the u.s. a debate later in the month and opec so when it comes to september, the avere numbers could suggest it could be an uneventful month, but that cou >> as we mentioned earlier, friday is the august jobs report and many believe that is the number the fed is looking at. adp said private companies added 177,. that was in line with the 175,000 estimates. steve liesman ta