The US Postal Service adopted plans to always keep stamp price increases at or below the rate of inflation. The stamp hikes will be annual and capped by the consumer-price index, replacing the old system of periodic and steep increases. The USPS had the right to still do one more hike under the previous rule, but opted to go for the inflation-indexed approach ahead of schedule. Those clever Forever Stamps which were to remain valid forever, will still be forever valid.
USPS Ties Stamp Rate Hikes To Inflation
By November 17, 2007