The price of a first-class forever stamp went up on last Sunday, from 50
cents to 55 cents. That 10 percent increase is the largest single price jump
in the history of the Postal Service, the Associated Press reports.

The Postal Service lost $3.9 billion in 2018. First class mail volume
decreased by about 2.1 billion pieces. According to USA Today, "it was the
12th year in a row the agency reported a loss despite growth in package
shipping."

It is also more expensive to send a package using Priority Mail. The price
of a small box rises from $7.20 to $7.90; a medium box increases from $13.65
to $14.35.

Source:
https://www.npr.org/2019/01/28/68923...-increase-ever