When you run a business, you need to ensure the revenues from your products at least cover your cost of providing them. Pretty basic business principle. But for the U.S. Postal Service, it’s much more than that — it’s a legal requirement. Specifically, the Postal Accountability and Enhancement Act of 2006 requires every postal product to earn enough to cover its costs. Sometimes, though, it’s not easy to determine if a business is factoring in the right data or correctly attributing expenses to