Six Days of Package Delivery and Five Days of Mail.  Does This Mean Stamp Prices Will Go Down by 16¢?   Michael Cohn at Accounting Today reports that the U.S. Postal Service said Wednesday that it will end Saturday delivery of letters starting in August, but will continue to deliver packages, in an effort to cut costs.  More: The Postal Service expects to generate cost savings of approximately $2 billion annually once the plan for five-day mail delivery and six-day package delivery is fully implemented. The move could have an impact on accountants and their clients who need to receive…