May's blockbuster retail sales report overshadowed shifting consumer trends that could widen inequality in the US

· US retail sales surged a record 17.7% in May, double economist estimates, following two consecutive months of record slumps.
· But, there are also signs of shifting consumer trends in the US that could widen the inequality gap. 
· "Consumer spending is always skewed toward higher income groups," wrote Samuel Coffin of UBS...