Market volatility soared at the end of 2018, and first week of the new year was no different. Last week started on a positive note after a rebound in oil prices and some hopeful signs of progress on the trade dispute with China. But indexes fell sharply after Apple warned it would cut revenue guidance for the first time in 15 years. Investors reacted to mixed economic data reports (business investment is down, jobs and wages are up) and by week's end, stocks soared after Fed Chairman Powell said he would not hesitate to respond to counteract an economic downturn.