The nationwide consumer mood stayed locked at 90.3 this week, according to the Morning Consult Index of Consumer Sentiment. Yet underneath that flat surface, wealthier and middle-class Americans moved in opposite directions. Confidence among high-income adults dropped 2.8 points to 108.4, wiping out a chunk of the gains they made the week before. This pullback lined up with a downward turn on Wall Street, where the S&P 500 slipped by about 1.6% over the course of the week.