OK - so you know that price increases from the United States Postal Service (USPS) are linked to increases in the Consumer Price Index (CPI), right? But did you know that there are controls on this? In fact, rises in prices for market-dominant postal products are subject to a statutory, CPI-based price cap. According to an explanation posted on the Postal Regulatory Commission (PRC) website, the PRC determines the price cap for any 12-month period by calculating the ratio of two 12-month CPI-U averages that are 12 months apart, subtracting one, and expressing the value as a percentage. Read more!