The Board of Governors of the U.S. Postal Service has approved an increase of most postal rates and fees by about 5.4 percent. The increases are needed to fulfill the requirements of a law passed in 2003 that requires the Postal Service to establish a $3.1 billion escrow account. The cost of a first-class stamp will increase from 37 cent to 39 cents on Jan. 8. The postcard rate will increase by one cent to 24 cents.