Letters wait in bins for sorting at the main post office in Omaha, Neb. The price of a Forever stamp has increased by 10 percent as the U.S. Postal Service contends with billions of dollars in annual losses.

Letters wait in bins for sorting at the main post office in Omaha, Neb. The price of a Forever stamp has increased by 10 percent as the U.S. Postal Service contends with billions of dollars in annual losses.