It is a tossup whether the market found a bottom this week, but bulls could find some support as corporations, mostly on the sidelines as the market tumbled, step up their stock purchases in the coming weeks. The equities selloff had its climax on Wednesday afternoon when the S&P 500 set its low for the week as concern over the global economy, conflicting views on the timing of the next policy move by the Federal Reserve, and headlines about the Ebola virus made investors even more skittish.