McDonald's shares slipped in premarket trading Tuesday after it reported higher third-quarter revenue but lower profit than last year, as the fast-food giant's same-store sales fell more than expected. The fast-food giant registered $6.87 billion in revenue, up from $6.69 billion last year and the $6.81 billion analysts expected, according to consensus estimates compiled by Visible Alpha. McDonald's also posted $2.26 billion in net income, down from last year's $2.32 billion and the $2.30 billion analysts ...