McDonald's Corp. (NYSE:MCD) is sounding the alarm on weakening U.S. consumer spending, particularly among lower-income customers pressured by the rising costs of necessities. MCD stock is up after earnings. See the real-time price action here. Consumers Are Pulling Back Further CEO Chris Kempczinski warned restaurant traffic from low-income diners continues to fall at a double-digit pace, a trend that has lasted nearly two years. Read Next: Michael Burry Is Super-Bearish On Palantir — With 5 Million Puts"We ...