Coke, McDonald's sales slips: blame millennials? By: CNBC.com News October 21, 2014 at 15:10 PM EDT As Coke and McDonald's earnings disappointed investors, millennial retail expert Ilana Stern explains what's to blame and what needs to be done. Read More >> Related Stocks: Chipotle Mexican Grill Coca-Cola Company Goldman Sachs Group International Business Machines McDonald's Corp Target Corp