The Postal Accountability and Enhancement Act of 2006 (PAEA) ushered in a new regulatory structure for the U.S. Postal Service. One key element was a price cap on market dominant products. (Most of the Postal Service's products are market dominant.) This means that price increases for market dominant products are capped by the rate of inflation as measured by the Consumer Price Index (CPI).
No pain no gain. The U.S. Postal Service has reduced spending over the past decade but it has come with a downside, notably a reduction in service. Over the past decade the Postal Service has reduced labor costs by $10 billion, improved productivity, and generally reined in spending.