The gap between those who can and those who cannot afford everyday essentials is widening, according to Walmart (WMT). "The disparity between the low-income cohort and the upper-income cohort has grown a little bit in recent months," Walmart CFO John David Rainey said on Yahoo Finance's Market Catalysts. "If you look at October wage growth … [the difference] was as large as it's been in almost a decade," he said. Walmart stock jumped over 6% in Thursday trading after the company posted better-than-expec ...