McDonald’s will extend its $5 value meal beyond its initial four-week window in most of its U.S. markets as the fast-food giant says the offer is driving traffic back to restaurants. In a memo to the U.S. system obtained by CNBC on Monday, executives wrote that nearly every business unit, encompassing 93% of its restaurants, voted to extend the promotion past its original end date late this month. The memo said the majority of locations will extend through August, or plan to vote on...