I have a solution to the post office budget problem:
First, deliver mail three times a week. Second, divide the routes into two groups. Group one delivers on Monday, Wednesday and Friday. Group two delivers on Tuesday, Thursday and Saturday.
To make it easy to schedule mail carriers, have them work four six-day weeks in each five-week period and take the fifth week off.
This way the United States Postal Service would need half as many mail carriers and delivery vehicles.