The United States Postal Service (USPS) is the biggest retailer in the country in terms of sheer size and locations, and a new Government Accountability Office (GAO)-commissioned report is examining the possibility of the post office growing its retail offerings. While the GAO is not talking about offering sandwiches, coffee or sleepwear, it is mulling expanding services that make the post office a destination – especially in rural locations. However, many ideas in the report were mulled over and then dismissed. All this, Today in Data.