The legal obligation that explains why the USPS cannot stop losing money
The United States Postal Service serves close to 169 million addresses, generally six days a week, whether or not any given route makes money. That is not a business choice.
TL;DR
- USPS serves close to 169 million addresses.
- Service is generally provided six days a week.
- Serving unprofitable routes is a legal obligation, not a business decision.